In, what is essentially a Bejeweled clone, the object is to match tiles, vertically or horizontally. You need to get three in a row and that's all there is to it. Excepting for that you can only switch tiles one square apart and... alien heads try to trick you by switching pieces around. Seriously.

It is called Attack from Mars, but the objects are all simple - match three balls. Match three Pac-man with spinny-top hat. Match three eggplant. There's no coherency to the objects you need to match. To make matters worse, these floating alien heads appear randomly over random pieces and switch them around.

That's right. The attack from Mars is happening in your incoherent game of Bejeweled. And the attack is really, really, mildly irritating.