Mr Tony Gowland pointed us toward his clever puzzle-platformer, Tealy & Orangey, and I am glad that he did. It sees you controlling two jumping balls at the same time – they both move left if you move left, both jump if you hit jump, and so on – to create some fiendish conundrums of spatial puzzling. Initially their obstacle courses are simply in parallel, but then they begin to join up, and then things get complicated. It’s neat. You should try it.
More of this sort of thing