4D Sokoban

Sokoban, but in 4 dimensions. Left board moves in XY, right board moves in ZW. At first, the game might seem extremely unplayable; however, if you persevere, you'll end up developing enough intuitions about 4D space to make the game just about barely unplayable.

Original game by Beekie, with a level from Corey Hardt. Modification by knexator, inspired by Tilmann's variation