Blind Microban is an itch.io minigame that you can currently play from the link below. In a nutshell, the level is invisible and you have to use sound to guess the layout. You don't have to beat the level itself to get a point, you just had to guess what the level would look like.

There are rules to follow and only a handful of symbols you can use, but all of it is on the page.
The minigame actually ran for some time, but we are currently stuck at level 18.

Try it out here : https://stingby12.itch.io/blind-microban