For the DS:
Wikipedia:
http://en.wikipedia.org/wiki/The_World_Ends_With_You
Battle Vid:
http://www.youtube.com/watch?v=3aGrR2T3-gM&feature=related
You basically battle using special pins which each have special touch commands that you perform for attacks. This game has a very unique story, great characters, and awesome soundtrack. This is quite possibly the best DS game thus far, and one of Square Enix's greatest non-Final Fantasy RPGs since Chrono Trigger. YOU WILL NOT REGRET BUYING IT!