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There are 12 different puzzles of increasing level of complexity. I took the puzzles from the book "The Zen of the Labyrinth" by Dave Phillips. I liked the puzzles and wanted to solve them, but it was too difficult to keep track of which color am I supposed to follow, especially for larger and longer puzzles. I searched for the javascript implementation on the internet, but only found some iOS app. I almost started writing it in javascript (and, eventually, did write it), but thought MSX Basic would be easier. It wasn't easier but it was fun nonetheless.
There are 8 more puzzles of this type in the book. However, they are more than 24 blocks high and do not fit easily in the chosen architecture and remain unsolved.