Contra, known as Gryzor in Europe and Oceania, is a 1987 run and gun action game originally released as a coin-operated arcade game on February 20, 1987.
The main character is equipped with a rifle with an unlimited amount of ammunition. The player can also jump, move and fire in eight directions, as well as move or jump simultaneously while firing. A single hit from any enemy, bullet, or other hazard will instantly kill the player character and discard the current weapon.
There are a total of over 10 areas in the game. There are two types of stages in Contra. In addition to the standard side view stages, Contra also features stages in which the player character is seen from behind and must move towards the background in order to proceed. Each of these "3D maze" stages are set inside the corridor of an enemy base in which the player must fight through the base's defenses in order to reach the core of the base. During the 3D maze stages, the upper screen will display a map of the base along with a time limit. Each maze stage is followed by a "3D fixed" stage set at the core of the base, in which the player must destroy a series of flashing sensors to expose an even larger sensor and destroy it.