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Four increasingly difficult variations of "Sokogen 990602 Levels #77" by Jacques Duthen. Aside from the green box, you can swap all other boxes around freely and still have a solvable level. That's 24 combinations, but I felt like that's too much for one level.
Original, which you should attempt before this one: https://www.sokobanonline.com/play/web-archive/jacques-duthen/sokogen-990602-levels/87495_sokogen-990602-levels-77