Friday the 13th (stylized as Friday the 13th: The Computer Game) is the first game adaptation based on the films of the same name. It was released in 1985 by Domark for the Amstrad CPC, Commodore 64, and ZX Spectrum. The game was released on floppy diskette and cassette tape. The player's goal is to find and kill Jason Voorhees, while making sure his friends or he himself are not killed by Jason.
The player can roam freely around the scenery and walk both inside and outside buildings. Jason, as well as other characters, do the same. It is the player's task to make sure his friends do not get killed by Jason, who often appears disguised as one of them, unless he is hit once and becomes visible as a man dressed in black. Various improvised weapons (e.g., a chainsaw, a pitchfork, a machete, etc.) are scattered around the camp and inside various buildings such as a barn, a church and a cabin. Once picked up, they can be used to confront Jason. There are five levels in the game and each time you play as another character.
The character assignment is random at the start of the round. The game uses an early pseudo-3D view along with a more traditional side view, depending on the character's location. The game also features a "fear meter", in the form of a blonde woman's head with hair standing on end, to symbolize the player character's level of fright at the time.
Unlike the later Nintendo Entertainment System (NES) title, the game included scenes of gore consistent with the film franchise. For example, when a character is killed by Jason, sometimes there is a scream followed by a quick cut to a graphic image of a machete embedded into their head. A similar startle effect would be used in the 1989 title Project Firestart.