If your looking for a handheld game you can put dozens of hours into, play this one

User Rating: 8.5 | Megami Ibunroku: Devil Survivor DS
I put tons of hours into Devil Survivor. This is a strategy role playing game where you have different types of devils that you capture and are able to unleash in battles. These battles can take awhile to beat some of them even last up to 30 min. The story-line in this game will have you wanting to play until the very end. It's about a group of people who are trying to figure out why the government trapped them inside a giant bubble in their town and won't let anybody in or out of the area. They use these things that look similiar to the Nintendo DS to capture and summon different types of demons. There are tons of demons to capture each with unique skills and attacks and really makes the battles interesting. This is one of the best handhelds RPG's I've played in awhile and I highly recommend it. You can easily put dozens of hours into this game without every even beating it. It's definetely worth the money.