Hocus [official site] translates the impossible shapes of late artist MC Escher into a perspective-twisting puzzle game. Think Back To Bed sans any sense of narrative, with explicit puzzle-focus. In theory, the premise is simple: guide the red cube across a grey shape tracks to the red goal, before moving onto the next level. In practice, the mind-bending, aspect-altering illusions of each layout makes this easier said than done. Hocus began life on mobile devices but has now reached Steam.