Sokoban (Japanese for "warehouse keeper") is a puzzle in which a man pushes boxes in a warehouse and tries to put them in designated spaces. He can push one box, but not two, and cannot pull a box.
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... to a smaller extent by the slipping friction.
The device is covered by US patents 3,726,146 (1973) and 5,353,655 (1994) by L.A. Mishler and US patent 5,800,3 ...