Tron is a coin-operated arcade video game manufactured and distributed by Bally Midway in 1982. The game consists of four subgames inspired by the events of the Walt Disney Productions motion picture Tron released earlier in the summer. The lead programmer was Bill Adams. The music programmer was Earl Vickers. Tron was followed by a 1983 sequel, Discs of Tron, which was not as successful. A number of other licensed Tron games were released for home systems, but these were based directly on elements of the movie and not the arcade game. Gameplay Tron consists of four sub-games based on events and characters in the movie. In general, the player controls Tron, either in human form or piloting a vehicle, using an eight-way joystick for movement, a trigger button on the stick to fire (or slow down the player's light cycle), and a rotary dial for aiming. The goal of the game is to score points and advance through the game's twelve levels by completing each of the sub-games. Most of the 12 levels are named after programming languages: RPG, COBOL, BASIC, FORTRAN, SNOBOL, PL1, PASCAL, ALGOL, ASSEMBLY, OS, JCL, USER. The game supports two players alternating. At the start of each level, the player is taken to a "Game Grid" selection screen divided into four quadrants. The player must choose a quadrant, each of which corresponds to a different sub-game. The sub-game in each quadrant is not known to the player until it is selected. If the player fails the game and loses a life, they are taken back to this selection screen and an icon representing that game is now visible. Failure to chose a quadrant before an on-screen timer runs out results in a sub-game being chosen at random. Once the player completes a particular sub-game, it is taken out of play until the start of the next level. The sub-games are as follows: I/O Tower The player must guide Tron to the flashing circle of an Input/Output Tower within a set time limit while avoiding or destroying Grid Bugs. This game is based on the I/O Tower scene in the film, while adding the Grid Bugs as enemies (which were only briefly mentioned in the film). A bit occasionally appears on the screen and can be picked up for bonus points. MCP Cone The player must break through a rotating shield wall protecting the MCP cone