Future: TMNT Cowabunga Collection

[shawngmc]

Source: https://store.steampowered.com/app/1659600/Teenage_Mutant_Ninja_Turtles_The_Cowabunga_Collection/

Status:

• All game data appears to be in assets.pie
  • assets.pie file has an even distribution, so is likely compressed and/or encrypted.
• Loads from asset.pie are done when
  • Starting the TMNT_Cowabunga.exe (Menu data)
  • Changing game shown in menu (video data, box art, etc.)
  • Starting game (likely inc. ROM data)
• A memory dump of the process when running TMNT1 for NES does yield the ROM, INCLUDING the iNES header, starting at 0x10DA141E
• However, these contents are not in assets.pie in plaintext!

The most likely location for the TMNT1 NES data, based on Process Explorer analysis, is at Offset 0x1E8E7630D, Length 262160 (10 bytes more than the 256KB we would expect for a 256KB NES ROM) It's also unclear what the immeadiate preceding read at 0x1E8E762B7 for 30 bytes is, but it reads a preceding 30 bytes for EVERY file it reads. Is this 30 bytes metadata or a key? These 30 byte chunks, as looked at for a few reads, seem to have even distributions and no recognizaeble structure. Possibly encrypted or a key itself?

Games: • Teenage Mutant Ninja Turtles (Arcade) • Teenage Mutant Ninja Turtles: Turtles in Time (Arcade) • Teenage Mutant Ninja Turtles (N) • Teenage Mutant Ninja Turtles II: The Arcade Game (N) • Teenage Mutant Ninja Turtles III: The Manhattan Project (N) • Teenage Mutant Ninja Turtles: Tournament Fighters (N) • Teenage Mutant Ninja Turtles IV: Turtles in Time (SN) • Teenage Mutant Ninja Turtles: Tournament Fighters (SN) • Teenage Mutant Ninja Turtles: The Hyperstone Heist (SG) • Teenage Mutant Ninja Turtles: Tournament Fighters (SG) • Teenage Mutant Ninja Turtles: Fall of The Foot Clan (GB) • Teenage Mutant Ninja Turtles II: Back From The Sewers (GB) • Teenage Mutant Ninja Turtles III: Radical Rescue (GB)

[shawngmc]

On the plus side, this appears to be feasible via https://github.com/Masquerade64/Cowabunga However, this might fall under decryption.

[Feilakas]

Decrypting the asset.pie works and results in a standard zip file that includes a "roms" subfolder.

The home console roms are immediately functional, however the two "Arcade" roms, found inside the "Konami" folder, are formed in a non-standard way, with files such as ".audiocpu", ".eeprom" ".maincpu" etc.

The following is a bash script that performs the conversion to "proper" ROMs. https://github.com/farmerbb/RED-Project/blob/master/ROM%20Extraction/tmnt-cc-arcade-extract.sh

It also uses the following conversion python tool: https://github.com/twistedsymphony/ts_rom_tool/blob/master/ts_rom_tool.py

Could these be incorporated into this game-extraction-toolbox (or perhaps a separate all-in-one tool specific to this collection because of the need for decrypting)?