nintendo 64 game paks (nus-006) are rom cartridges that store game data for the nintendo 64. their sizes vary from 4 mib (32 mibit, such as "automobili lamborghini" and "dr. mario 64") to 64 mib (512 mibit, such as "resident evil 2" and "conker's bad fur day"). the game pak's design tradeoffs were intended to achieve maximal system speed and minimal system cost, with a lesser storage space and a higher unit cost per game.