Have never seen this puzzle before. This is an excellent puzzle and I wish there were a word to describe games like this! The world needs more games like this, and having a good word to describe would help! Love the different scenarios and increasing mechanics as the game proceeds. Play this game, you will not be disappointed. Now, I am not a fan of the “You solved all the levels, now go back and find the hidden gems, or replay some of the levels with a different goal”. If you want the gems, fine, just let me find them as I play. If you have new authentic levels, let me play them. But I don’t want to go back and resolve things. So just let me solve all the real levels and say I’m done.