The arcade version of Contra consists of seven stages (the number of stages and level structures vary in later versions). The first stage is a side-scrolling level where the player character is dropped into the jungle and must fend off the enemy's initial line of defense until he reaches the entrance of the first base, where he must destroy a large sensor to enter the base. The game switches to a 3D view for the second stage, where the player character must fight his way through a series of passageways inside the base before time runs out (a display at the top of the screen shows the map of the base and the time remaining). The player must destroy a generator at the other side of each passageway in order to deactivate the electric current, preventing access. The third stage is set in the core of the base on a fixed screen, where the player must destroy the enemy's defense system in order to expose the final target, a giant eyeball that shoots fireballs. Stages 4 through 6 proceed similarly to the first three stages. Stage 4 is a vertically-scrolling level where the player must jump their way to the top of a waterfall until reaching the entrance of the second base, where the player must destroy a large diamond-shaped sensor guarded by a defense system in order to clear the stage. Stage 5 is another 3D stage set inside another base, while Stage 6 is another boss battle, this time against a pair of heads that split into two images each. The heads can only be damaged when their split images align together.
Use arrow key and try some key ( Shift, Enter, Z, X, A, S , Q, E, R, T, G, F, H ) to controls the game.