Where it says "click on the digit 3 to enable undo for all moves", what exactly does that mean? I've tried pressing the 3 key but it does nothing but make the background a bit lighter. I thought that would mean undo for all moves is enabled, but when I tried to undo, it didn't go back any farther than if it were just regular undos. Please help, I'm kind of clueless here.

Hey finley! Thanks for asking here, didn't realize that a bug creeped in during the last update. It should be fixed now :)

You were doing everything right (clicking on the digit 3), it just wasn't working... Renamed the thread so that there's a place for future bug reports.

ah, thanks!