Katamari Damacy (PlayStation 2, 2004)

This game is so simple and so fun I can hardly limit myself to one star a day. Basic premise: you have a ball, you roll it (like a snowball) and pick up most interesting things- cats, dogs, frogs, susi, people- the bigger the ball the bigger the objects you can add to your ball. When you have finished the Katamari, the King of the Cosmos will pick you up and take you home on the Royal Rainbow where he will release your Katamari into the sky to replace one of the stars he accidentally deleted. Supremely fun, super addictive, and a soundtrack you can enjoy for hours (even days) after. As your skill improves, the difficulty rises. I would rate this as fun for all ages.