To help you, you have a huge collection of weapons available, including muskets, missile launchers, machine guns, and shotguns. You also have a jetpack that lets you fly short distances and avoid obstacles. Plus, you'll find some settings full of surprises like trampolines and teleporters.
Both players can play using the same keyboard, one on the left and one on the right. The controls are pretty simple, since you just need to use a few keys along with the arrow buttons (WASD if you're on the left).
Madness Reloaded is a really fun game for two players. Its 11 different phases and two different game modes guarantee hours and hours of fun for you and a friend on the same computer.