Half-Life 2: Episode Two

This page details development materials of Half-Life 2: Episode Two.

This page is rather stubbly and could use some expansion.
Are you a bad enough dude to rescue this article?

To do:
Resource Gathering prototypes included with the game's map sources.

How about a nice leek in this trying time?

'This page or section details content from the2016-2017 Facepunch Half-Life Leaks.'''

'This page or section details content from theSource Developer Asset Repository leaks.'''

The Source Developer Asset Repository is a repo full of all manner of unused/early content for many Source Engine games, including Half-Life 2: Episode Two. For someone to have gained to the repository, one must obtain a license from Valve Software at the cost of $2,500 after your project was approved for licensing, and sign a non-disclosure agreement. Despite the NDA requirement and fee, many files from the repository have been leaked online over the years, shedding some light on all sorts of odd unused concepts found in the game.

Episode Two's history of leaks started in 2016, with the entirety of the game's map source files being leaked, and it all coming to an end with the 2023 Source Developer Asset Repository leaks. It is important to note that everything leaked at the same time, but it was not released to the public at the same time.

Textures#

Antlion Egglayer#

A texture sheet for a cut Antlion Egglayer - but not the actual model - were leaked as part of the 2023 Source Asset Repository leaks.

How the Egglayer may have looked like. Recreation by Cvoxalury.

Magnusson#

An early facemap for Dr. Magnusson was leaked with the 2023 leak as "maggie_facemap".

Concrete Textures#

A texture that was used a lot in Portal.

Models#

Juvenile Advisor#

While the Juvenile Advisor's texture sheet is in the game files, the model however, is not. Pictures of the model have been leaked many times. But the model itself was not leaked until the 2023 Source repo leaks. Specifically it was released early in December 2022, but the model came from the repo.

Animations#

Jalopy#

Animations for the cut Jalopy car still exist showing the placement of the bones and the overall layout of the cut Jalopy. One example of which is vehicle_wheelspin.smd.

The bones show the locations of the fenders, the fridge, the fan in the engine, and more.

Muscle Car#

There are cut animations for the trunk of the muscle car opening and closing.

Maps#

The map sources for Episode Two's maps were leaked to the public in 2016-2017. Within the map sources there are also earlier revisions of the used maps and even test maps for cut features.

To do:
Info about unused visgroups

experiments#

Some of the maps present here were actually experiments and concept tests intended for future installments of the Half-Life franchise after Episode 3 was scrapped. This is supported by the date of many of these maps dating to after the release of Counter-Strike: Global Offensive in August 2012, long after Portal 2 and Left 4 dead 2 which were Valve's biggest titles following Episode 2.

File	NET Date	Description
instances
crate_spawn	November 28, 2012	A template for creating item crates.
dead_slump_zombie	November 28, 2012	A template for creating sitting zombies who stand up and attack when the player is nearby.
door_spawn	November 28, 2012	A template for a blocked door with a Zombie behind it.
spawn_player_with_items	November 28, 2012	A template for creating a player starting point with items.
spawn_zombie_slump_a	November 28, 2012	Same as dead_slump_zombie.
spawn_zombie_slump_b	November 28, 2012	Same as dead_slump_zombie.
spawner_combine_and_manhack_squads_radius	November 28, 2012	A template for creating Combine Soldier and Manhack squads.
spawner_combine_squads_radius	November 28, 2012	A template for creating Combine Soldier squads.
spawner_headcrabs_single	November 28, 2012	A template for creating various types of Headcrabs
spawner_resupply_crate	November 28, 2012	A template for creating item crates.
spawner_zombies_radius	November 28, 2012	A template for creating various types of Zombies.

arena_1	November 28, 2012	A test map for a NPC spawner templates.
dog_gates_canyon	November 28, 2012	A follow up to dog_gates_hub. It uses a modified version of ep2_outland_05. The Antlion Guard is missing in this version. After player frees Dog, he follows him to the canyon area. Dog takes a friendly turret from one of the buildings and attaches it onto himself. After the fight, he opens up the gate to the elevator and then sits on the ground. There is a red Combine Rollermine attached to the elevator. When Dog picks up the Rollermine, it gives him the ability to disable the red lasers which act like Combine force fields. Player returns back to dog_gates_hub from Tunnel 36 and rescue Alyx behind a laser gate.
dog_gates_hub	November 28, 2012	The first part of a gameplay experiment which involves Dog. It uses a modified version of ep2_outland_02 and includes some areas from other Episode Two maps as well as an area from Episode One. Player finds Dog imprisoned behind a force field but he can't free him yet. Alyx is in the Tunnel 12, behind red lasers.Player picks up a crowbar from the elevator car nearby. The elevator crashes down with the player in it. This route leads to the blocked fence area behind Dog. The player can now enter the breach which leads a tunnel where we pick up the Gravity Gun. When player frees Dog, he attempts to go through the lasers but fails. He then opens up a storage closet nearby, and the gate to the tunnel 24, and follows us to next map, dog_gates_canyon.
dog_resource_gathering	June 20, 2013	Same concept from ken_resource_gathering. It appears to be broken. The map uses areas from various Episode Two maps. The player has to collect three gears to open the gate to the White Forest base.
ep2_outland_06a_clean	November 28, 2012	ep2_outland_06a without gameplay elements. It shows the radio tower area.
ep2_outland_10_clean	November 28, 2012	ep2_outland_10 without gameplay elements. It shows the White Forest Inn.
ep2_outland_10_remix_dark	November 28, 2012	ep2_outland_10 without gameplay elements. It shows the White Forest Inn with some differences. It takes place at night.
ep2_outland_12_clean	November 28, 2012	ep2_outland_12 without gameplay elements. It shows the area where Gordon fights Striders to protect the White Forest base.
ken_resource_gathering	June 20, 2013	A gameplay experiment which involves the player gathering resources by shooting at enemies. When shot, they leave colored resources behind. There are three type of resources: Biological, Mechanical, and Energy. These can be used to open gates or upgrade Dog with new abilities in a station.With these upgrades, Dog can attack enemies with weapons, open gates, gather resources, and do many other stuff. There are strange variations of enemies. For example, there is a Fast Zombie variant which uses Antlion's model and has a red skin. When killed, Fast Headcrabs spawn inside its body and attack us.
z_test_case_1	November 28, 2012	It appears to be a test map for a NPC spawner templates. It uses a room from Episode One's "ep1_c17_00a".

instances#

File	NET Date	Description
outland_building_large_01	November 28, 2012	A house at the opposite of the barn from ep2_outland_07. It is occupied by the Combine and is covered by fortification. There is also a watchtower on the roof.
outland_building_medium_01	November 28, 2012	A small building.
outland_building_medium_02	November 28, 2012	A small hut.

personal#

File	NET Date	Description
david
hunter_dss	July 24, 2007	A test map for the interactions between (such as getting impaled) Citizens and Hunters.
hunter_fear	August 11, 2006	A test map where Hunter attacks a scared Citizen who runs away.
hunter_jeep	January 9, 2007	A test map where the player runs over Hunters using the Muscle Car.
hunter_leap	August 29, 2006	A test map where Hunter attacks a Citizen.
hunter_shoot_alyx	November 8, 2006	A test map for the Alyx getting stabbed by Hunter sequence.
hunter_striderbuster	February 22, 2007	A test map for the Strider Buster with Striders and Hunters.
hunter2	October 18, 2006	A test map for Hunter.
hunters	October 23, 2006	It is a portion of ep2_outland_12 covered with a cordon (which prevents the rest of the map from compiling). It shows the Strider battle area and some of the buildings.
gautam
ep2_outland_08_chopper	July 23, 2006	An early version of ep2_outland_08. This is the part where Gordon drives into a rebel hideout and his car stops working. It looks like there was to be a huge train yard in the place of the hideout in the original version.
test_intro_zombies	December 11, 2006	It is the mine area from ep2_outland_01. It looks like the path leads to additional mine areas instead of the radio shack.
ido
chopper_test3	June 8, 2006	A test map for Combine helicopter. Sometimes it drops bombs and player sends back at it.
chopper_training	June 8, 2006	Same as above. It drops bombs more frequently in this version.
ep2_outland_12a_controlroom	September 25, 2006	An early version of ep2_outland_12a. This version features a different ending. The map begins in the White Forest base after the battle. Like in the final game, we go to the control room and launch the rocket. Then we get into the helicopter waiting for us at the outside of a hangar, and fly up.
smoke_test	June 22, 2006	A test map for the White Forest rocket's smoke trail particle effect.
smoke_test_1	June 8, 2006	Same as above.
johnm
12_work	March 18, 2007	A sequence from ep2_outland_12. The rebels cheer after Gordon wins the battle at the White Forest base.
jweier
advisor	December 1, 2006	It is the barn where Gordon encounters an Advisor in ep2_outland_07. The scripts are broken. There are energy shields around the pod.
philco
ep2_outland_01_0609	June 5, 2006	An early version of ep2_outland_01. In this version, Alyx falls down from a hanging train car. Gordon survives the crash and jump down into a river. A Vortigaunt comes to help and stays with wounded Alyx. It also opens up the path by destroying a container door. Gordon reaches a building near a mine complex. Here, he pushes a cart with the Gravity Gun to reach the other side of the room. Then he goes down to a cave with water in an elevator.
ep2_outland_01_0629	June 28, 2006	Same as above. The train debris was updated and the elevator button was moved.
ep2_outland_01_0705	July 3, 2006	Same as above. This time the cart is operated by a lever.
ep2_outland_01_0928	September 25, 2006	Same as above. Gordon rides an elevator near the cliff with the Vortigaunt who carries Alyx. In the new building, the player opens up a gate to the mine complex. When the player tries to go back, he falls down into the Antlion caves and gets separated from the group.
ep2_outland_01_1010	October 9, 2006	Same as above.
ep2_outland_05_0109	January 6, 2007	An early version of ep2_outland_05. There are resistance supply caches in the holes on the ground. The Antlion Guard comes out of the ground. The elevator gate is operated by a wheel. The elevator has a crowbar in it.
ep2_outland_05_0412	April 11, 2007	Same as above. This appears to be same as the final version of the map, except the crowbar is still in the elevator.
ep2_outland_05_1025	October 23, 2006	Same as above. An earlier version of the map. Appears to be the same as ep2_demo_canyon.
ep2_outland_05_1114	November 13, 2006	Same as above. The ground is more green. There is only one thumper on the center.
ep2_outland_05_1213	December 11, 2006	Same as above. The supply crates are in holes in the ground again. There are three thumpers.
ep2_outland_05_1218	December 11, 2006	Same as above.
ep2_outland_06_0417	April 16, 2007	An early version of ep2_outland_06. It shows the bridge. It looks very close to the final version.
ep2_outland_06_1011	October 10, 2006	Same as above. An earlier version of the map though it looks and plays the same. The zombie prison is missing. There is another toxic pit on the other side of the bridge.
ep2_outland_06_1013	October 11, 2006	Same as above. The second toxic pit was removed.
ep2_outland_06_1205	December 1, 2006	Same as above. It is more close to the final version.
ep2_outland_06a_0616	June 16, 2006	An early version of ep2_outland_06a. The map looks completely different and has more in common with Half-Life 2's coast maps. Gordon begins in a car with Alyx. The bridge ahead is destroyed, so he goes down another path to reach the other side. He enters a communications center where Alyx attempts to contact the White Forest base but the power gets cut off. Gordon goes to the other building and activates the power. The Combine Hunters attack him. He escapes in the car and jump over a destroyed bridge.
ep2_outland_06a_0711	June 8, 2006	Same as above. This time the first bridge is not broken. The road next to the center is blocked by a destroyed tanker. The entrance is locked, so we go through a hole in the wall and reach the basement where we turn on the power. Gordon goes up and Alyx contacts the base but the power gets cut off. Since there is no way back, the player must go through an air duct. He finds out that out that Hunter was responsible for the power something. He opens the front gate and drive around the center.
ep2_outland_06a_0912	September 7, 2006	Same as above. The road to the center was completely changed and the center looks different. The destroyed bridge at the end was removed.
ep2_outland_06a_0921	September 20, 2006	Same as above. The layout for the center was changed. It plays the same, except the player has to go through a fan hole to get back to the basement.
ep2_outland_06a_0929	August 24, 2006	Same as above. The road to the tower is damaged. The basement area was changed again.
ep2_outland_06a_1010	October 9, 2006	Same as above. The center is more detailed and the player opens the front gate from a small building nearby.
ep2_outland_07_0405	March 16, 2006	An early version of ep2_outland_07. Gordon begins in a car with Alyx on a road. Since the road is blocked by a destroyed tanker, he jumps over a ramp in a car and reach a barn area. The Combine Advisor in the barn has giant plugs attached to its life support system. When these are destroyed, it flies away and escape. The rest of the map plays the same.
proto_gastrap	February 7, 2007	It is a prototype version of the gas trap from ep2_outland_06.
proto_zombie	October 23, 2006	It is a prototype version of ep2_outland_06. It shows the Zombie prison below the bridge.
test_holdout	April 2, 2007	It is a test map for the Zombie prison section of ep2_outland_06.
test_lighting	April 7, 2007	A test map for lighting.
sawyer
hunter_intro	November 7, 2006	An early version of ep2_outland_06a. It shows the radio tower area where Gordon encounters Hunters. There are two buildings and the power building has no basement. Gordon collects batteries to power up the center instead.
Stephane
ep2_freightelevatorbutton_test	February 8, 2007	A generic freight elevator from mine areas.
ep2_naturemodels01	April 27, 2006	A gallery for the nature-related models.
ep2_outland_01h	June 1, 2006	An early version of ep2_outland_01. It is similar to Phil Co's work. The train debris are is completely different. The Vortigaunt has a rebel friend. Gordon skips the buildings and enter the mine complex area this time. This path probably leads to the area where Gordon meets Griggs and Sheckley. The hallway looks similar to the one from ep2_trailer_03, so it is likely that the Vortigaunt carries wounded Alyx through this path.
ep2_outland_01Isa_01	June 1, 2006	Same as above.
ep2_outland_01o	April 27, 2006	Same as above.
ep2_outland_02_stephtest	March 12, 2007	An near-finalized version of ep2_outland_01a and ep2_outland_02 in a single map. Griggs and Sheckley use different rebel character models. Sheckley is black, so we assume this was when he was voiced by Earl Alexander.
ep2_outland_02_websacks	April 12, 2007	Same as above.
ep2_outland_03_websacks	April 12, 2007	A near-finalized version of ep2_outland_03. Nothing interesting.
ep2_outland_04_lever	April 2, 2007	A near-finalized version of ep2_outland_04. Nothing interesting.
ep2_outland_04_steph	December 21, 2006	Same as above, but it is very different. There are two fans in the pipe. The first one is not functional, and the player has to use a metal beam to stop the second one. There is a new room before the player drops down to the Antlion caves. The part where Gordon finds the cog for the elevator is covered with webs. The cog itself is in a metal box. The path to the Nectarium appears to be blocked and there is nothing behind it.
ep2_outland_04_websacks	April 12, 2007	Same as above. This is more close to the final version of the map.
ep2_outland_05a	June 8, 2006	An early version of ep2_outland_05. It visually looks different. There are no thumpers. The Antlion Guard comes out of the ground and the elevator gate is operated by a wheel. The elevator looks like a shark cage and is on the ground level.
ep2_outland_06_stephtest	February 8, 2007	A near-finalized version of ep2_outland_06. Nothing interesting.
ep2_outland_07_stephtest	February 8, 2007	A near-finalized version of ep2_outland_07. It looks similar to ep2_demo_driving.
ep2_outland_10a_steph	March 12, 2007	A near-finalized version of ep2_outland_10a. This is where Gordon meets Dog. Combine Elites attack when the Strider appears.
ep2_outland_12_steph	March 12, 2007	A near-finalized version of ep2_outland_11b and ep2_outland_12 in a single map. The layout for the White Forest base is different. Eli's room is not present in this version.
ep2_outland_12a_steph	March 12, 2007	A near-finalized version of ep2_outland_12a.

Main Folder#

File	In-Game?	NET Date	Description
advisorBarnTest	✗	November 21, 2006	A test map for the barn's roof destruction sequence from ep2_outland_07.
borealis_interior	✗	April 20, 2007	A styleguide interior for the Borealis. It contains a few hallways. This was probably intended for Episode 3 or for a cut monitor scenes of the Borealis.
demo_blob	✗	August 15, 2006	This is a second demo that was meant to go with the Source Particle Benchmark. It features npc_blob and showcases some of its functions.
devtest_01b	✗	July 4, 2007	A developer test map for Episode Two. Nothing interesting. This map was included in the Android port of Episode Two.
ep2_background01	✓	June 6, 2007	Same as the shipped version. A background map for Episode Two.
ep2_background02	✓	August 3, 2007	Same as above.
ep2_background02a	✓	May 23, 2007	Same as above.
ep2_background03	✓	June 6, 2007	Same as above.
ep2_comm_hunter_01	✗	August 17, 2007	This map looks similar to ep2_trailer_07. The teleporter model from Half-Life 2 is hidden in the missile silo layer. It is most likely a placeholder.
ep2_demo_01	✗	May 10, 2007	The first part of a series of unreleased maps which appear to be created for the Xbox 360 demo version of Episode Two. This map is a modified version of ep2_outland_01. The level ends when the player leaves the communications shack, the game then loads ep2_demo_02.
ep2_demo_02	✗	May 13, 2007	A follow up to ep2_demo_01. It's a modified version of ep2_outland_01a. The level ends after Gordon explores some cave areas, the game then loads "ep2_demo_05".
ep2_demo_05	✗	May 13, 2007	A follow up to ep2_demo_02. It is a modified version of ep2_outland_05. This is the area where Gordon fights and kill the Antlion Guardian. The level ends when the Guardian appears, the game then loads "ep2_demo_06a".
ep2_demo_06a	✗	June 7, 2007	A follow up to ep2_demo_05. This map is a modified version of ep2_outland_06a. It is the area where we power up a generator to use a radio in order to contact the White Forest base. The level ends when Gordon and Alyx use the radio. While this appears to be the last part of the demo, there are additional demo maps in the map pack.
ep2_demo_07	✗	May 1, 2007	Another unreleased map for the Xbox 360 demo of Episode Two. It is a modified version of ep2_outland_07. The level begins in the barn after the encounter with the Advisor. This is the only map with a loading zone.
ep2_demo_08	✗	May 1, 2007	The follow up to ep2_demo_07. It is a modified version of ep2_outland_08. This is the part where Gordon reaches a rebel hideout and destroy a Combine helicopter.
ep2_demo_10	✗	May 1, 2007	Another unreleased map for the Xbox 360 demo of Episode Two. It is a modified version of ep2_outland_10. This is the part where the Combine ambush Gordon in the White Forest Inn. The level ends when we go back to disable the forcefields.
ep2_demo_advisor	✗	August 4, 2006	A staged scene for the Episode Two trailer released on August 30th 2006. It shows an Advisor moving forward and looking at the camera.
ep2_demo_antlions	✗	August 17, 2006	It appears to be the scene from Episode Two's "Gameplay Demo 1". It uses a modified version of ep2_outland_01a.
ep2_demo_antlions_short	✗	August 17, 2006	Same as above.
ep2_demo_barn	✗	August 15, 2006	An early version of ep2_outland_07. The level begins in the barn where Gordon meets an Advisor in a life support system. If the player spawns Alyx, she walks up to a console and opens the pod. The machine parts are breakable and there are three plugs under it.
ep2_demo_canyon	✗	August 15, 2006	An early version of ep2_outland_05. This is the area where Gordon fights and kills the Antlion Guardian. The exit to the Antlion caves is a pipe. There are two Antlion Guards present in the map. There are no thumpers, mine entrances. The elevator at the end is like a shark cage and is operated by a rebel called "basket guy".
ep2_demo_chopper	✗	August 17, 2006	An early version of ep2_outland_08. This is the part where Gordon drives into a rebel hideout and our car stops working. The level ends when the player enters one of the buildings and the roof collapses.
ep2_demo_dog	✗	August 17, 2006	An early version of ep2_outland_10a. It shows Dog attacking the Strider from a trailer.
ep2_demo_driving	✗	August 17, 2006	It appears to be the scene from Episode Two's "Gameplay Demo 3". It uses a modified version of ep2_outland_07. The player begins in the barn when the Combine attack. Like in the final game, he escapes in a car. Alyx is not present in the map. There is a crash site with Strider gibs and a destroyed windmill near the barn. As seen in ep2_outland_07_stephtest, this is a placeholder for the crashed Advisor Pod.
ep2_demo_fastzombie	✗	August 4, 2006	A map based on early version of ep2_outland_07. The Fast Zombie running on a train sequence from the Episode Two trailer released on Steam August 30th 2006.
ep2_demo_flashlight	✗	August 15, 2006	Same as ep2_outland_06a_0912, except it was modified to be used for a trailer.
ep2_demo_forest	✗	August 17, 2006	A staged scene for a trailer, showing a Hunter killing a rebel. It is the same area from ep2_trailer_07.
ep2_demo_gman	✗	August 11, 2006	A staged scene for the Episode Two trailer released on August 30th 2006, showing Alyx lying in a pitch black room as the G-Man watches. The hidden layers include some parts from early version of ep2_outland_01a. It looks like Alyx was to travel through the mines with Gordon, while he use flares to light the way.
ep2_demo_gman_lean	✗	August 11, 2006	Same as ep2_demo_gman.
ep2_demo_guard	✗	August 17, 2006	A staged scene Episode Two's "Gameplay Demo 2". It uses an early version of ep2_outland_04. It shows the Antlion Guardian chase scene in the Antlion caves. The hidden layers reveal different incarnations of the mines.
ep2_demo_strider	✗	August 17, 2006	An early version of ep2_outland_12 modified for a trailer. It shows the part where Gordon protects the White Forest base from Striders. There are Combine Soldiers with rocket launchers and a Vortigaunt on the battlefield.
ep2_demo360_01	Console	November 1, 2007	The Xbox 360 demo version of ep2_outland_01. The demo ends when the player pushes a mine cart to destroy wooden planks that block the way out.
ep2_intro	✗	August 24, 2006	The original introduction to Episode Two. It shows the ending sequence of Episode One, then loads the map ep2_outland_01. The Citadel's cut destruction sequence is shown in this version.
ep2_outland_01	✓	September 17, 2007	Same as the shipped version.
ep2_outland_01a	✓	August 14, 2007	Same as the shipped version.
ep2_outland_02	✓	August 14, 2007	Same as the shipped version.
ep2_outland_03	✓	August 22, 2007	Same as the shipped version.
ep2_outland_03_ps3	Console	September 21, 2007	Same as above. It is the PlayStation 3 version of the map. There are some minor differences with the Zombie spawns.
ep2_outland_04	✓	October 8, 2007	Same as the shipped version.
ep2_outland_05	✓	August 18, 2007	Same as the shipped version.
ep2_outland_06	✓	August 16, 2007	Same as the shipped version.
ep2_outland_06a	✓	August 21, 2007	Same as the shipped version.
ep2_outland_07	✓	August 15, 2007	Same as the shipped version.
ep2_outland_07_barn	✗	July 14, 2006	An early version of ep2_outland_07. Player begins in the barn with Alyx. She touches the console and awakens the Advisor. When the player destroys three plugs under the life support system, the Advisor flies up and escapes. The rest of the map looks the same except with more fog.
ep2_outland_08	✓	August 21, 2007	Same as the shipped version.
ep2_outland_09	✓	August 16, 2007	Same as the shipped version.
ep2_outland_10	✓	August 14, 2007	Same as the shipped version.
ep2_outland_10a	✓	August 18, 2007	Same as the shipped version.
ep2_outland_11	✓	August 3, 2007	Same as the shipped version.
ep2_outland_11a	✓	September 10, 2007	Same as the shipped version.
ep2_outland_11b	✓	July 23, 2007	Same as the shipped version.
ep2_outland_12	✓	August 16, 2007	Same as the shipped version.
ep2_outland_12a	✓	July 31, 2007	Same as the shipped version.
ep2_trailer_01	✗	March 14, 2006	The first part of a series of maps which appear to be created for the trailer at the end of Episode 1. This map shows Alyx hanging on a train car in an early version of ep2_outland_01. This version of the map is similar to Phil Co's work. Since the building is inaccessible, we enter a mine area infested with Antlions. This path leads to the area where we meet Griggs and Sheckley in another version of the map.
ep2_trailer_02	✗	March 14, 2006	A staged scene for the trailer at the end of Episode 1. A Vortigaunt is carrying the wounded Alyx and leaves her on a table in an early version of ep2_outland_02. The hidden layers include a very early version of the mine areas.
ep2_trailer_03	✗	April 19, 2006	A staged scene for the trailer at the end of Episode 1. It shows rebels fighting Antlion waves in an early version of ep2_outland_02. The layout is similar to the styleguide_mining version from Episode One's leak. A Vortigaunt carrying Alyx arrives at the scene from the back tunnel.
ep2_trailer_04	✗	April 9, 2006	A staged scene for the trailer at the end of Episode 1. The Antlion Guardian chases the player in the Antlion caves in an early version of ep2_outland_04.
ep2_trailer_05	✗	March 14, 2006	A staged scene for the trailer at the end of Episode 1. This is one of the earliest incarnations of ep2_outland_06a. It also includes a car with comically large tires. Unfortunately, it is not useable by the player.
ep2_trailer_07	✗	July 19, 2006	A staged scene for the trailer at the end of Episode 1. A Hunter jumps down and ambushes the player an early version of the White Forest base.
ep2_trailer_08	✗	July 14, 2006	A staged scene for the trailer at the end of Episode 1. It was most likely used to show the bridge destruction sequence. It uses an early version of ep2_outland_06. It looks similar to ep2_outland_06_1011 but with some differences.
ep2_trailer_09	✗	July 14, 2006	A staged scene for the trailer at the end of Episode 1. A Vortigaunt attacks the Antlions in the Antlion caves. It seems like the player was to go through this area with Alyx and a Vortigaunt.
ep2_trailer_10	✗	June 8, 2006	A staged scene for the trailer at the end of Episode 1. It shows the Strider battle from ep2_outland_12.
ep2_trailer_11	✗	July 26, 2006	Same as above.
ep2_trailer_11a	✗	August 17, 2006	A staged scene for the trailer at the end of Episode 1. It shows Kleiner in the missile silo. Eli's room is on the ground floor of the silo in this version. The hidden layers reveal an early version of the White Forest base.
ep2_trailer_11a_mossmanshot_1	✗	August 4, 2006	Same as ep2_trailer_11a. This was used for the Mossman shot of a trailer.
ep2_trailer_12	✗	July 11, 2006	Same as ep2_trailer_10 and ep2_trailer_11.
jeep_cowpuncher	✗	October 20, 2006	It is a test map for the Muscle Car with a cow catcher attached to its front. The primary attack key swings the catcher.
jeep_zombiebaseball	✗	October 23, 2006	It is a test map for the Muscle Car with a wooden stick attached to its left side, which acts as a bat. The primary attack key swings the stick.
jeep_zombiezapper	✗	October 23, 2006	It is a test map for the Muscle Car with electric shock devices attached to its front, and a charge meter next to the wheel. The primary attack key delivers an electric shock.
montage_antlions	✗	August 17, 2006	An early version of the Antlion caves with mine areas.It was most likely used for a trailer montage. It uses parts from ep2_outland_01a and ep2_outland_03. The hidden layers reveal many cut areas, including a room with electric fence.
particle_benchmark	✗	August 15, 2006	It is the test map from the Source Particle Benchmark.
particle_zoo	✗	October 23, 2006	A test map for particle effects but the particle effects are missing. Nothing interesting.
proto_finale1	✗	April 19, 2006	A prototype version of ep2_outland_12 where Gordon fights Striders to protect the White Forest base. The map looks completely different. Strider Busters spawn in ammo crates.
proto_finale2	✗	May 22, 2006	Same as above. The map is much larger and has more buildings. This time we get a mission briefing from Odessa Cubbage, now a General, in his cabin. It looks like he survives the battle.
proto_finale3	✗	May 23, 2006	Same as above. The map begins in a bunker area where Gordon fights Combine Elites and find his car in a tunnel.
proto_gameplay_woods	✗	October 9, 2006	A generic Episode Two outdoor area with fog and a house with a dead citizen in it. The level begins in a car with Alyx. It looks like the Combine was to attack player when he enters the house.
proto_gman_scene	✗	November 21, 2006	A prototype version of the G-Man sequence from ep2_outland_02.
silo_nexus	✗	September 7, 2006	An early version of ep2_outland_10a which also includes parts from other maps.
styleguide_01_antenna	✗	January 9, 2007	A huge antenna tower.
styleguide_06_elev_tower	✗	January 14, 2007	It appears to be the elevator tower from ep2_outland_05.
styleguide_11a	✗	April 5, 2007	An early version of ep2_outland_11a. These are the tunnels where Gordon fights the Combine Soldiers and Hunters in the White Forest base.
styleguide_barn	✗	April 27, 2006	An early version of ep2_outland_07. It is the barn except without the Combine machinery and the Advisor.
styleguide_barn_deterioration	✗	July 26, 2006	Same as above. It is an updated version of the barn with some miscellaneous objects nearby.
styleguide_bunkers	✗	August 28, 2006	Early White Forest base interior and exterior areas, including the missile silo. The design of the base is similar to the one from proto_finale3.
styleguide_caves	✗	June 18, 2006	Early Antlion caves.
styleguide_farmhouse1	✗	April 27, 2006	An early version of ep2_outland_07. It shows the house at the other side of the barn.
styleguide_farmhouse2	✗	April 27, 2006	An unused farm house.
styleguide_farmyard	✗	April 27, 2006	An early version of ep2_outland_07. It shows the barn and the buildings nearby, including the house from styleguide_farmhouse2, and a small cabin. The Combine and their machinery are not present.
styleguide_forest_01	✗	August 4, 2006	An early version of ep2_outland_12. It only shows a small part of the map and there is a dried-up riverbed nearby.
styleguide_inn	✗	July 26, 2006	An early version of ep2_outland_10. It shows the White Forest Inn and some nearby buildings. The Inn looks noticeably different and has some inaccessible rooms.
styleguide_logging	✗	July 28, 2006	Some of the buildings from ep2_outland_12.
styleguide_radiotower	✗	July 3, 2006	It looks similar to ep2_outland_06a_0711 with some differences.
styleguide_radiotower_a	✗	November 28, 2006	An early version of ep2_outland_06a. The radio tower area is similar to the final version of the map.
styleguide_radiotower_b	✗	December 1, 2006	Same as above. This one shows the other buildings in the radio tower area.
styleguide_silo	✗	June 29, 2006	It appears to be an early version of ep2_outland_11a. This is the area where we fight the Combine Soldiers and Hunters in the White Forest base.
styleguide_silo_derilict	✗	April 5, 2006	This map includes early versions of most White Forest base areas in a single map. There are some hidden layers.
styleguide_vista_01	✗	April 5, 2006	An early version of ep2_outland_01. It is similar to ep2_outland_01_1010 but more detailed. The player has to open a floodgate on the left side of the debris to reach the Vortigaunt and bring it to Alyx for help.
test_bridge	✗	August 24, 2006	A test map for the bridge destruction sequence from ep2_outland_06.
testroom_areaportal	✗	February 3, 2009	A test room for area portals.
testroom_demo1	✗	February 20, 2009	A test map for an entity named "demo1_entity" with "amplitude" and "radius" fields. There are generic props around the entity.
testroom_demo2	✗	February 20, 2009	A test map for an entity named "demo2_entity". It appears to be a test map for a particle effect.
testroom_demo3	✗	February 20, 2009	A test map for an entity named "demo3_entity".
testroom_demo4	✗	February 18, 2009	A test map for an entity named "demo4_entity". It is a test map for the particle effects.
testroom_demo5	✗	February 18, 2009	A test map for an entity named "demo5_entity". It uses Alyx's model.
testroom_flashlight	✗	February 9, 2007	A test map for Episode Two's flashlight.
testroom_vort	✗	February 1, 2007	A test map for a Vortigaunt's lighting.
zoo_foliage	✗	December 1, 2006	A zoo map for foliage props.
zoo_lights	✗	November 21, 2006	A zoo map for light entities and props.
zoo_rocks	✗	December 1, 2006	A zoo map for rock props.
zoo_striderbuster	✗	August 24, 2006	A zoo map for the Strider Buster related props.