Your mission is to destroy the fierce alien invaders. Blast through attacking enemies, obstacles and hurdles as you master the power-up items that appear along the way, then destroy the enemy headquarters. You will lose a life if you are touched by an enemy, hit by enemy fire, or fall into a pit. The game ends when you lose your last remaining life. Up to two players can play at the same time. Work together and head for enemy territory! If one of the players holds back when playing with two players, the screen won’t scroll and you won’t be able to go farther. Also, if Player 1 has no lives left, they can press to use any remaining lives Player 2 has, and vice versa when Player 2 runs out of lives.