1) it has an expert mode
2) you have to hit 3 or 4 arrows at the same time
3) it has bombs with the arrows that come up and if you hit them they explode and i dont know what they do.
there are more features than that, but i was basing the above info on my spectating, because i ran out of cash to play. i think it has the word "groove" in it.. generic dance game name. i'm thinking it's american, but it looks like fun.