Half-Life 2: Episode One

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

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

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 One. 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 One'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.

Maps#

The map sources for Episode One's maps were leaked to the public in 2016-2017. Within the map sources there are also earlier revisions of the used maps of Episode Two, Lost Coast and cancelled Episode by Junction Point Studios.

To do:
Info about unused visgroups

dev#

File	NET Date	Description
testmap_alyx_startgreet_01	April 25, 2005	A test map where Alyx looks at a stripped Combine Soldier lying on the ground and comments about him.
testroom_alyx_lighting	March 21, 2006	A test map for Alyx's lighting.
testroom_alyx_lighting3	April 10, 2006	Same as above.
testroom_combinedoor_1	June 2, 2004	A test map for the Combine doors which appear in Citadel core area.
testroom_materialmodify	March 30, 2004	A test map for changing materials present on a brush.
testroom_measure_movement	June 2, 2004	A test map for "logic_measure_movement" entity.
testroom_point_camera_teleport	June 20, 2004	A strange test map which involves a Citizen going through a portal-like brush.
testroom_standards	April 13, 2004	A test room for the game's standard scale units. This map was also leaked along with Half-Life 2 in 2003.
zoo_animations_alyx	December 28, 2004	A zoo map for showcasing Alyx's animations from the Half-Life 2 era.
zoo_cable	September 11, 2003	A zoo map for showcasing cables. This map was also leaked along with Half-Life 2 in 2003.
zoo_combine	May 3, 2004	A zoo map for Combine prefabs from the Half-Life 2 era.
zoo_dust	January 2, 2002	A zoo map for dust motes effect. This map was also leaked along with Half-Life 2 in 2003.
zoo_lighting	September 20, 2002	A zoo map for testing object lighting. This map was also leaked along with Half-Life 2 in 2003.
zoo_lights	April 2, 2004	A zoo map for light prefabs.
zoo_model	June 13, 2001	A zoo map for models. This map was also leaked along with Half-Life 2 in 2003.
zoo_particle	February 26, 2002	A zoo map for particles. This map was also leaked along with Half-Life 2 in 2003.
zoo_portal	September 16, 2003	A zoo map for area portals. This map was also leaked along with Half-Life 2 in 2003.
zoo_shader	May 16, 2002	A zoo map for shaders. This map was also leaked along with Half-Life 2 in 2003.
zoo_standards	February 13, 2003	An earlier version of testroom_standards.
zoo_weapon	June 13, 2001	A zoo map for player weapons. This map was also leaked along with Half-Life 2 in 2003.

personal#

File	NET Date	Description
aaronb
d2_LostCoast_camera	December 28, 2004	The video stress test version of the early Lost Coast.
d2_LostCoast_scene	February 24, 2005	An early version of the Lost Coast.
d2_monastery_hdr_camera	March 27, 2005	A camera that shows the inside of the Lost Coast's monastery. It was most likely created for the video stress test version of the map.
shorts_SaintOlga	March 18, 2005	Another early version of Lost Coast.
shorts_SaintOlga_interior	March 16, 2005	The Lost Coast monastery interior.
shorts_SlotCanyons	March 18, 2005	A modified version of Half-Life 2's d2_coast_11.
dario
canyon_test	March 21, 2005	This map appears to be an early version of Episode Two's ep2_outland_05 where the Gordon fights and kills the Antlion Guardian. It is a large wasteland-themed canyon map with destroyed buildings and ships.
rift_test	December 28, 2004	A Combine-occupied industrial area next to a large canyon.
tunnel_test	March 11, 2005	An early version of the Antlion caves from Episode Two. The player goes through a series of maze-like tunnels with Alyx and two Citizens to reach the surface. According to the developer notes, they would come across a hole that only the player can jump across. Alyx and the others would go back and wait for the player to find a way out.
wasteland_test	December 28, 2004	A wasteland-themed survival map where the player fights endless waves of enemies while trying to find six petrol canisters to fuel a chopper. This map was included in an update to Episode One in May of 2013 but later removed.
wasteland_test2	December 28, 2004	Same as above.
wasteland_test3	December 28, 2004	Same as above.
david
logic_branch_listener	March 22, 2005	An empty test room with several unconnected "logic_branch_listener" entities.
ministrider	March 29, 2006	A small test map for Hunters.
ministrider_intro	June 1, 2005	A Hunter in Half-Life 2's d1_trainstation_03.
dhabih
cit_splode	August 23, 2005	A test map for the Citadel's destruction sequence.
doug
crash_test1	September 1, 2005	A test map for the Gunship crash sequence from the finale of Episode One.
destruction1	September 9, 2005	A test map for the train ride sequence from the finale of Episode One.
Intro_test	November 7, 2005	A test map for the intro of Episode One.
Intro_test2	November 7, 2005	Same as above.
stridertest	September 26, 2005	An early version of ep1_c17_05. The player begins in a burned version of the hospital. The escort mission is longer and takes place outside. The player leads the Citizens to a train waiting near the train station. The red gate at the entrance was originally to appear in Half-Life 2's d2_coast_07. The train station resembles the one from Half-Life 2.
traintest3	October 4, 2005	Same as above.
gautam
proto_snow_01	May 11, 2006	An arctic-themed map. Nothing interesting.
styleguide_ravenholm_01	May 16, 2006	This map appears to be from the cancelled Half-Life 2 Episode which was being developed by Junction Point Studios in late 2005. It takes place in a snow-themed version of Ravenholm which includes small puzzles, scripted sequences, and fights. This game is not related to Arkane Studios' cancelled Episode Four, also known as Return to Ravenholm, which would have also take place in the town. It is implied that the player crashes into a warehouse in a gondola. He wakes up in a room with two unique characters named Duncan and Scooter. There is a train station and buildings nearby. A group of rebels and Combine Soldiers fight on the streets. > Duncan (ravenholm_npc_mueller) and Scooter (ravenholm_npc_scooter) are unique entities. Duncan uses a generic Citizen model, while Scooter's model is unknown. > Some entities use JPS as their prefix in their names, which obviously stands for the studio's name. In addition to this, some objects have fields called magnet and magnetization, which are related to the Magnet Gun mentioned by Warren Spector in the interviews.
Jaken
vmfImport
└─ EntityImport_45degTest2	April 10, 2006	Nothing interesting.
└─ EntityImport01	April 10, 2006	Nothing interesting.
└─ GeometryImport01	April 10, 2006	Nothing interesting.

Attachment_IK_01	February 6, 2006	A test map for Episode One's intro scene where Alyx looks at a monitor.
KeypadTest	January 31, 2006	A test map where Alyx uses a keypad.
KleinerCast_MergeMe	January 31, 2006	A test map for KleinerCasts.
ProjectorPlacement	February 6, 2006	A test map for projector from Episode One's the intro scene.
SS1	April 7, 2004	A test map for scripted sequences.
SS2	April 7, 2004	Same as above.
VCD1	September 13, 2004	A test map for choreographed scenes.
jeffl
proto_ally_heli_1	December 28, 2004	A friendly Combine helicopter in a modified version of Half-Life 2's d1_canals_08.
proto_ally_heli_3	December 28, 2004	A friendly Combine helicopter in a coast-themed test map.
mattwood
binarycube_work_02	June 8, 2006	A strange map that features floating transparent pieces that rotate and eventually form a cube, which shows Alyx for a moment.
randyl
training_home01	June 10, 2005	A map that features an unfinished house.
zoo_lights	March 31, 2005	Same as zoo_lights from "dev" folder.
sawyer
ministrider	March 3, 2005	A test map for Hunters. The map appears to be partially based on the Palace map from the leaked version of Half-Life 2.
projects	March 31, 2005	A large open space with buildings, small cabins, wrecked cars, and a car park.
siege	April 25, 2005	This map appears to be an early version of Episode Two's ep2_outland_09 where the player tries to stop a Combine Autogun in a scrapyard.
warehouse_jump	March 27, 2005	A warehouse full of zombies. The player was to use the buggy to get into the building by crashing through a window on the rooftop.
zombiedriving	March 3, 2005	A generic large outdoor area with some set pieces from Half-Life 2's coast maps. There is no goal, other than to drive around in the buggy and run over zombies.
steved
hook_on_rope	January 4, 2006	It is a small room with zombies and hooks attached to ropes.
jeep_crate_puzzle	January 4, 2006	The player opens a fence gate and goes through a hanging container with the buggy.
test_kleiner_tests	February 28, 2006	A test map for a strange usable Combine device. Kleiner watches the player from the corner.

Main Folder#

File	In-Game?	NET Date	Description
credits	✓	August 3, 2004	Same as the shipped version. It is an unused credits map.
devtest	✗	May 23, 2007	A developer test map which was previously leaked in the Android ports.
devtest_01b	✗	September 9, 2005	Same as above.
devtest_02	✗	June 15, 2005	A developer test version of Half-Life 2's d3_c17_06a.
devtest_03	✗	December 16, 2004	A developer test version of Half-Life 2's d1_trainstation_03.
devtest_04	✗	November 8, 2004	A developer test version of Half-Life 2's d1_canals_09.
devtest_05	✗	November 16, 2004	A developer test version of Half-Life 2's d1_town_02a.
devtest_06	✗	June 15, 2005	A developer test version of Half-Life 2's d2_prison_08.
devtest_07	✗	November 16, 2004	A developer test version of Half-Life 2's d3_c17_12.
ep1_background01	✓	July 26, 2007	Same as the shipped version. A background map for the game's main menu.
ep1_background01a	✓	July 20, 2007	Same as above.
ep1_background02	✓	July 20, 2007	Same as above.
ep1_c17_00	✓	July 23, 2007	Same as the shipped version. Nothing interesting.
ep1_c17_00a	✓	August 7, 2007	Same as the shipped version. Nothing interesting.
ep1_c17_01	✓	August 17, 2007	Same as the shipped version. There are some hidden layers.
ep1_c17_01a	✓	August 16, 2007	Same as the shipped version. There are some hidden layers.
ep1_c17_02	✓	August 14, 2007	Same as the shipped version. Nothing interesting.
ep1_c17_02a	✓	August 1, 2007	Same as the shipped version. Nothing interesting.
ep1_c17_02a_demo	✗	May 8, 2006	A smaller version of ep1_c17_02a. Nothing interesting.
ep1_c17_02b	✓	August 2, 2007	Same as the shipped version. Nothing interesting.
ep1_c17_03	✗	May 6, 2005	A scrapped map for "Urban Flight" chapter. On this map, Gordon and Alyx are located in one of the courtyards of City 17 and they need to fix the elevator in one of the buildings to escape from a horde of zombies.
ep1_c17_05	✓	July 20, 2007	Same as the shipped version. There are some hidden layers.
ep1_c17_06	✓	August 3, 2007	Same as the shipped version. There are some hidden layers.
ep1_citadel_00	✓	August 1, 2007	Same as the shipped version. There are some hidden layers.
ep1_citadel_00_demo	✓	April 24, 2006	This map was included in the final game but it can't be played or decompiled. It is nearly identical to ep1_citadel_00 with some minor differences.
ep1_citadel_01	✓	August 21, 2007	Same as the shipped version. There are some hidden layers.
ep1_citadel_02	✓	August 14, 2007	Same as the shipped version. There are some hidden layers.
ep1_citadel_02b	✓	August 18, 2007	Same as the shipped version. Nothing interesting.
ep1_citadel_03	✓	August 14, 2007	Same as the shipped version. There are some hidden layers.
ep1_citadel_04	✓	August 17, 2007	Same as the shipped version. There are some hidden layers.
ep1_intro	✗	April 10, 2006	An early version of ep1_citadel_00. It shows the intro sequence.
ep1_intro_00	✗	June 15, 2005	An earlier version of ep1_citadel_00. It shows the intro sequence. In this version, when the G-Man inspects Alyx, the background turns black and the Vortigaunts interfere.
hdrtest	✗	February 24, 2005	An early version of the Lost Coast. The level begins in a different area.
proto_ministrider_intro	✗	March 31, 2005	An updated version of David Sawyer's projects map.
styleguide_antlion_tunnel	✗	March 10, 2006	An early version of Episode Two mines. This map was leaked in the Android ports.
styleguide_antlionhole	✗	October 25, 2005	A test map for the Antlion hole burying mechanic.
styleguide_c17_rubble	✗	January 4, 2006	Destroyed City 17 streets.
styleguide_c17_rubble_2	✗	January 9, 2006	An early version of ep1_c17_01.
styleguide_core	✗	November 17, 2005	An early version of ep1_citadel_03. It shows the Citadel's core room.
styleguide_destroyed_citadel	✗	December 13, 2005	An early version of ep1_citadel_02.
styleguide_garage	✗	November 10, 2005	An early version of ep1_c17_00. It shows the garage area.
styleguide_garage_antlionroom	✗	December 6, 2005	An early version of ep1_c17_00a. It shows the garage area with multiple floors.
styleguide_garage_destroyed	✗	December 1, 2005	An early version of ep1_c17_00. It shows the garage area.
styleguide_hospital_exit	✗	November 28, 2005	An early version of ep1_c17_05. It shows the entrance to the train station.
styleguide_mining	✗	March 10, 2006	An early version of Episode Two's ep2_outland_02 where the player fights waves of Antlions. This map was leaked in the Android port of Episode One.
styleguide_riverbed	✗	February 17, 2006	An early version of Episode Two's ep2_outland_01. This map was leaked in the Android port of Episode One.
styleguide_riverbed2	✗	February 17, 2006	A generic Episode Two forest setting. This map was leaked in the Android port of Episode One.
styleguide_train_loadingdock	✗	November 17, 2005	An early version of ep1_c17_06. It shows the train station area where the player fights a Strider.
styleguide_train_repair	✗	November 14, 2005	An early version of ep1_c17_05. It shows the repair room of the train station.
wasteland_test	✗	October 25, 2005	Same as wasteland_test from Dario Casali's folder.
zoo_citadel_destruction	✗	December 6, 2005	A zoo map for the destroyed Citadel interior pieces.