Super-cool! Some pieces of feedback: 1) It would be nice to have something special happen when you solve all the puzzles, rather than going back to the first.

Super-cool! Some pieces of feedback: 1) It would be nice to have something special happen when you solve all the puzzles, rather than going back to the first. Some javascript balloons dropping from the ceiling? ;_) 2) Some of the problems, it's hard to tell why an answer doesn't work. A side-by-side diff showing my results compared to the expected results might help? 3) After solving (perhaps just one, or maybe all), I'd love to see other people's solutions. That'd be quite educational.