Watch out the monster is right behind you! In this Monster Invade shooting game, your goal is to survive the various monsters as they are allowed into the arena. The A, S, D, and W keys are used to move around the arena, and you can use the mouse to aim and fire at the monster. There are a variety of weapons to use as you progress through each level, and watch out because they are coming at you from every side. Be very careful in this arena because in Monster Invade if you arent watching, the monsters kill you.