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In the rocket assembly station, eight new rockets are nearing completion. Due to specialized construction equipment in various sections, the rockets have to exchange their places. Rockets A, B, C and D must fit into areas 9, 10, 11 and 12, respectively.
During the moving, only one rocket can fit into a section at any one time. Nothing is in areas 5, 6, 7 and 8, so they can be used for juggling. When moving, you can go as many spaces at a time as wanted, if they are available. The puzzle is solvable in 43 moves, but it isn't guaranteed to be any easy puzzle to solve.