As reader Aurelio points out, One and One Story has a fair bit in common with indie classic Braid. There's the mysterious story throughout that doesn't completely piece itself together until the end. Then there's the game mechanics that change every now and again and force you to go back through previous levels with a totally different light on what you're doing.

The idea is to help the girl and the boy reach each other. Sometimes you'll be controlling them separately, and other times you'll have to put up with the girl going walkies on her own. There are plenty of other mechanics to work your way through too.

Give it a play, it's pretty good fun. Over at Armor Games.