On level 2 of Mario game I went past the finish line but the game didn't count it, I think I jumped over it.
I enjoyed the concept a lot, it made for some fun puzzles, like how to jump onto a platform then onto another surface, which would not be a puzzle in a game that you would just play. The controlling got tedious after a while, at least in the Mario game. I didn't know how to quit the game (in the game) and try the other game so I quit the game (real game). (Sooo meta).
Enjoyed it, but it got tedious.