I played the first Super Mario Galaxy and absolutely loved it, so knew I'd get this as soon as it came out. I've already put in some serious hours, and must only be a third of the way through it. I love the way it makes you feel compelled to keep going and getting more stars - I MUST RESCUE PRINCESS PEACH!!!

I haven't played it multiplayer yet, and maybe it's unfair for me to review a game before I've finished it, but even at this stage through it I'd highly recommend it.