Zap'em is a single-player casual, arcade game in which players control a spaceship on the left side of the screen, capable of moving vertically and firing lasers to destroy incoming enemies. In this game, players face waves of enemy ships approaching from the right, with the goal of shooting as many as possible to earn points. Some enemies require multiple hits to destroy, while others are ghost ships that can temporarily disappear, adding complexity to the gameplay. It stands out with its sci-fi theme and simple yet challenging mechanics, including a fuel system that limits movement and firing, making resource management a key aspect of the game.