This introduced a new bug where the master marble can get caught between a peg and the wall because it's slightly larger than other marbles, lol. I'm fixing this now and will push a new version to fix this within the hour!
EDIT: It's fixed! While I was at it, I improved Tutorial cards by making it so that you had to click on them directly to dismiss them. No more spam-clicking them away by accident. I also added a "Got it" button to them and fixed a bug where the Kinetic Core tutorial was showing up at 49 marbles instead of 50 thanks to the last change where the upgrade starts at 1.