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.

• NullpoMino
• NullpoMino League Edition

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• Belzebub's NullpoMino Mod
• TouhouMino
• Blitz's NullpoMino customization and mod pack
• Integration's mod (new singleplayer modes & options)
• 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, so this is not technically open-source in all other operating systems.