Altered is a puzzle game made of boxes. Yes boxes... but you can't just stay in the box to solve them... you have to go "outside the box" in your mind and on your keyboard. Alter your character and the objects to complete each puzzle. This is no ordinary mind boggling teaser. Play at your own speed and learn to trial-n-error your way around each puzzle.

https://glitchheart.itch.io/altered

Altered has a free native Linux demo available on the itch page. It ran perfectly without any issue whatsoever. Be patient and enjoy!

Specs:
Mint 20.1 64-bit
GeForce GTX 1060
Nvidia 460