Show HN: Invisitris a Tetris-like game, where the placed pieces become invisible

Great idea, the game is very challenging,

Cool idea! I want to say there is a similar mechanic in the game Tetris Effect when playing the connected mode against the bossea where pieces become invisible as soon as they are placed. This is slightly more forgiving than that.

Great execution on mobile as well. Almost didn't try it as I didn't expect it to work, but it was intuitive and performant.

What did you use you make it?