You can undo by pressing the Left arrow key on your keyboard

Temporary marking suddenly not showing up

A way to reset progress

Progress not saved after level 30

Level 89 not completing on hard mode

DM for free CDKey

I can't get the last achievement

Numbers Level 13 up are out of sight

Got all achievements upon opening game?

Unable to Capture Game in OBS, No Video Settings or Audio Settings?

What does "favorite" icon do?

Achievements got after game closed

Solved indicator wrt. hard mode

Progress lost after crash

Solution to blue 3 demon mode required re-entering