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The game play is modeled after Super Famicom picross. If you fill in a tile black, then that is a correct tile. The game won't let you unfill black tiles. If a tile ends up with a red X, that tile is not part of the puzzle and you get a time penalty. Red Xs are also permanent.

Black X's can be removed, as they could be incorrect. The game was extensively tested, including solving all puzzles manually and using nonogram tools to verify the puzzles are correct. If you think a puzzle might be wrong, can you send a screenshot to matt@retrodotcards.com?

If you ever wonder, it seems like you can't put the game on a battery less bootleg cartridge, GBATA and the other software that add the battery less patch doesn't understand how to patch it