Lots of content, but the puzzle design is just downright frustrating. There were many times I would finish levels and not even really understand why what I did worked. Even the hint system just like tells you exactly where to place a few rails, which does nothing to guide you to the high-level goal of the level (usually because there isn't a clear one anyway). It has a nice style and some of the gimmicks are neat in concept, but I can't bring myself to keep playing this when there are much better puzzle games out there.