Pokemon Gen 1 Leaks

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Assets and source code of the first generation of Pokémon games (specifically, Pokémon Blue and Pokémon Yellow) were leaked April 12, 2020 on 4chan's Pokémon board. Some assets from the aforementioned leak were previously released and were the ones given to Helix Chamber for their coverage. However, that release was in the form of PNG conversions of Game Boy graphics and some text notes.

What Leaked?

  • Localization Source Code
  • Debug Builds

Where's the Files?

These are relative to an archive known as OriginalSource.zip (password: poke1024) inside of osrc.zip. The text files and source files are encoded in Shift-JIS, so you might want to use an editor that supports it, such as Notepad++.

Pokémon Blue

  • blue8M/blue8M - Pokémon Blue localization source code.
    • DATA/ - Graphics, tile maps, various data
    • Document/ - Early translations, issue tracker, localization notes. Includes early Pokémon tagline: "Catch them if you can!"
    • EFFDATA/ - Tile maps, Super Game Boy palettes, battle graphics. Includes some early "GAME FREAK PRESENTS" graphics. (in DEMO_TIT.DAT)
    • MAPDATA/ - Map graphics and blocks.
    • MONSDATA/ - Pokémon sprites.
    • source/ - Game program source code.
    • SXY/ - NPC and event positions for each map.

Pokémon Yellow

  • yellow/ - Pokémon Yellow localization source code.
    • yellow/ - Yellow-specific data
    • DATA/ - Graphics, tile maps, various data
    • Document/ - Issue tracker, notes, faxes. Includes a high resolution render of the title screen (presumably for press purposes).
    • EFFDATA/ - Tile maps, Super Game Boy palettes, battle graphics. Includes some early "GAME FREAK PRESENTS" graphics. (DEMO_TIT.DAT)
    • MAPDATA/ - Map graphics and blocks.
    • MONSDATA/ - Pokémon sprites.
    • Source/ - Game program source code.
    • SOUND/ - Sound samples for every Pokémon.
    • test/ - Contains a single batch script.
    • final/ - The retail Pokémon Yellow ROM.
    • SXY/ - NPC and event positions for each map.