A maze chase on a Möbius strip. Eat every dot. The ghosts pass through walls, of course, because they don't walk your maze: they walk the maze on the other side of the paper, half a strip away. Its faint violet rails show through. They take their signals from over there, and they reach you through the paper.
But a Möbius strip has only one side. Walk half a strip and you're on the maze they were bound to, and they're bound to the one you left. Clear both faces to clear the level.
Swipe or use the arrows. The band at the top is the strip itself.