NullpoMino is an open-source¹ Tetris game. As a result, users can create custom NullpoMino mods (rotation systems, playfield dimensions, etc). Graphical, music, game list, etc. mods are possible on any operating system, but source code mods (required for custom rotation systems, pieces, etc.) only in Linux. Sorry, Windows users.

• NullpoMino
• NullpoMino League Edition

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• Belzebub's NullpoMino Mod
• TouhouMino
• Blitz's NullpoMino customization and mod pack
• zeromeaner
• SJB's NullpoMino Skins
• Bringing NullpoMino back to life
• nm9: NullpoMino 9 engine
• NullpoMino Art Mod
• Modding NullpoMino

¹Modifying the code must be done in Linux, as other operating systems ignore the source code.