I'm trying to make some custom Tetrominoes for Puyo Puyo Tetris 3DS, and I can't figure out how to get into the files. I have tried;
Puyo Tools (because the COMP file header)
Switch Toolbox (unsupported)
Kukkii (unsupported)
renaming it to puyo_beta.dds, and opening it in GIMP, (didn't work)
and...