The Nintendo World Championships competition was based on a custom NES cartridge by the same name. Ninety of these copies exist as the official gray cartridge and were given out to finalists after the championships concluded. Each gray cartridge has a unique number making the cartridge easier to track and difficult to counterfeit. The circuit boards in the gray and gold cartridges are identical. Both versions of the cartridge feature DIP switches on the front which select the time limit of the game. To play the cartridge, one must have a controller connected to both controller ports and press start on the second player's controller. For the competition, there was a special switch that would start all games simultaneously.