Devil & Angel Sky Battle

High above the stars, an angel and a devil circle a gleaming board and fight the oldest argument there is — with clouds. Take turns flying around the board's edge, pick a row or a column, and hurl your cloud in from either end. Your cloud lands on the first square and everything in its path slides along one place. Run out of room and the cloud at the far end is shoved clean off the edge, where it bursts in a shower of light. Make a full line of your own clouds — across, down or corner to corner — and you win. The catch is that nothing ever stays where you put it.