If you havn't picked this game up yet, you're an idiot. It's a music/rhythm game that is just extremely fun.
If you aren't familliar with the genre... in most of the games... a marker moves across the screen and when it reaches a certain point you push the button corrisponding to that marker. Soo in a game like Dance Dance Revolution you push the down arrow with your foot when the arrow moves over the stationary arrows at the top of the screen.
That's how MOST of these music/rhythm games work.... this one is a little different. The markers are stationary and instead they have a circle that closes in on them, and when the circle closes in all the way you push that marker. The closer you get to when it actually is closed in, the more points you get.
Simple enough right? Well this game is simple enough that my 8 year old brother could play... but it has complex enough difficulties that it even challanges me.
IGN gave this game a 9.5 and it deserves every point of it.