Tron was more or less 4 games in one: Grid Bugs, MCP cone, Tanks and Lightcycles.
It was a nightmare numbers game based on the Disney movie, TRON. The player's challenge was to first seek out and then to decode the evil Master Control Program. The videogame used the movie music as a sound support. French, Italian and German translations of the dialog were recorded but never used.
Tron was the first game with no printed instructions on the machine. To read the rules, the player had to use the trigger of the joystick, and read them on-screen.
Tron II was released as Tron: Maze-A-Tron
fig. 1. Tron
fig. 2. Tron