Destroy all the aliens and free the earth. You control a game character from the first person and you have a rapid-fire weapon with an infinite number of shells at your disposal. To destroy the enemy, you need to hit him several times. The number of remaining hits to destroy is indicated above each enemy. The number of enemies not destroyed is displayed in the upper corner of the screen. The exit will open after the destruction of all enemies on the level. Do not touch other objects and walls, otherwise a life will be lost.