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In my opinion, the only thing you need to solve these kind of puzzles is a ton of patience - and possibly the ability to visualise objects spacially. I am very good at the latter. Patience can be a different matter, though. At times I have tons of patience. It just oozes out of me. But today I had none. I cheated. After a "very" short trial period I just looked at the solution. Actually, you can only use the solution paper if you can visualise objects spacially, since it is kind of hard to draw a movement in two dimensions - at least for this puzzle it is.