Tony Hawk's Underground 2: Remix

To do: There's at least one unused article of clothing. Document fixes found in the "Shrek SuperSlam" revision build. Also compare both builds to the later European release.

Tony Hawk's Underground 2: Remix is a port of Tony Hawk's Underground 2 for the PlayStation Portable, with some exclusive content to remix things up.

PlayStation 2 Format Files#

All models for the game have mesh and texture files exported in PS2 format alongside the PSP format, including every model that was built specifically for Remix. It is known that initial development began on PS2 before the porting team received Sony's official PSP development kits.

What is noteworthy is that Remix exclusive models have higher resolution textures in the PS2 format, as seen in the example below.

Previously Undocumented Cheat Codes#

The only previously documented cheat codes for the game are tightrope, which unlocks the 'Perfect Rail' cheat, and birdman which unlocks THPS1 Tony Hawk as a playable character. However, there are numerous other cheat codes defined within the game's scripts. These cheat code definitions are not defined in plaintext, but instead stored as hashed values using a custom hashing algorithm based in part on iteratively hashing the cheat code using CRC32 100,000 times. Because of this, the cheat codes cannot be trivially determined or decoded. However, through bruteforcing numerous possible cheats, a number of previously undocumented cheat codes have been discovered.

It is worth noting that many of these cheat codes' effects can be unlocked through gameplay as well.

Development Unit Switch Debug Display#

There are a number of General Purpose Input (GPI) dip switches within the hardware development kits used by developers to test, debug, and develop PSP games¹. The status of each dip switch is checked by calling a kernel function, sceKernelGetGPI(). While these dip switches do not exist within retail PSP units, by modifying the return value of sceKernelGetGPI() to non-zero values, one can pretend that certain dip switches are enabled. The retail version of Tony Hawk's Underground 2: Remix retains calls to this function within its code, and when pretending certain dipswitches are enabled, various debug information is displayed on-screen. Depending on the switches enabled, this can include a bar displaying Graphics and CPU loads, an FPS display, and a breakdown of the specific features that are contributing to those loads.

With all displays enabled, some of the fields displayed include:

GE:
    Level
    LevelObjs
    Skinner
    TransLevel
    FX
    2D
    TB::PlotTimeBars
    (remainder)
CPU:
    UpdateUVWibbles
    game_logic
    misc updates
    Level
    LevelObjs
    Skinner
    TransLevel
    FX
    FlexParticles
    NewParticles
    Splats
    2D
    TB::PlotTimeBars
    (remainder)
The Gap
The Gap Peak
Right now
You still need

Debug Options#

Code for a debug menu is present within the game's scripts. While not usually accessible to the player, the only check in place to determine whether or not to show the debug menu is a check of a flag in memory indicating whether or not the game is running off of a UMD (for ULUS10014, this flag is at 0x08a651d4). By setting this flag to false before opening the pause menu in game, a new 'Debug Options' entry appears, similar to the original version of the game.

Pause Menu	Debug Options

Cheats: Debug#

Available options from the 'Cheats: Debug' menu are:

• Time of Day
• View Cutscenes
• Levels Unlocked
• Goals to complete bracket
• 100 Stat Points
• Beat current goal
• Unlock all chapters
• Unlock all stats goals
• Score 5 million points
• Mark all goals unbeaten
• Set Difficulty Level

Goto Restart#

The Restart menu lists available spawn points within the current level. Selecting one will teleport you to that location.

Debug Menu#

Available options from the debug menu are:

• Auto Rail Level
• Time Of Day
• Lighting Tool
• Rail Display Toggle
• Bouncy Object Debug Display Toggle
• Toggle Profiler
• Toggle FPS Display
• Toggle Anim Times
• Toggle Particle Times
• Toggle Particle Emit Dir Display
• Toggle Model Scene Light Display
• Toggle Geom Scene Light Display
• Toggle Active Scene Light Display
• Toggle Geom Stats
• Toggle Poly Count
• Toggle Free Memory
• Defrag Animation Cache
• Wireframe Toggle
• Wireframe Skins Toggle
• Show Vert Polys
• Show Wallride Polys
• Show Trigger Polys
• Show Camera Polys
• Show Not Skateable
• Show skater shadow
• Show no skater shadow
• Show no skater shadow wall
• CheckForHoles (Slow)
• Hide HUD

Test Menu#

Available options from the test menu are:

• View Humans
• View Cutscene Heads
• View Animals
• View Cars
• View Cutscenes
• Set Pro Skater
• Set Pre-Made Skater
• Edit Appearance
• dialog box
• Scrolling Menu
• Face Texture Test
• View High Scores
• Keyboard

Hidden Logo#

A plane with a red skull like image can be found outside the boundaries of the Santa Cruz level, around the boardwalk zone. This can be located either by using the Moon Gravity cheat or through the use of glitches. Its purpose or meaning is entirely unknown.

References#