Local multiplayer games on phones are a rare sighting. Only a handful of games can advertise such a feature and almost none have hit the mainstream except Mini Militia. If you aren't aware of it, just go to any university cafeteria and you'll find a bunch of guys huddled around, playing this game.
Mini Militia is a side-scrolling shooter where the idea is to kill your friends as many times as possible with the wide array of guns available. You have a jetpack with limited fuel that replenishes and there are pickups available all over the maps. The game is incredibly fast paced so you'll have to be on your toes at all times. One thing to remember is that you won't be good straight away. In fact, you will be terrible. Dexterity comes with practice and that practice can be hugely rewarding when you have the bragging rights in your group. It's a game that's easy to play but difficult to master. If you have a long break between classes, Mini Militia is a great way to pass the time.