To celebrate its 25th anniversary, check out 10 facts about the Nintendo 64. While in development, the Nintendo 64 was codenamed \"Project Reality,\" but that was obviously never meant for mass consumption. Nintendo 64 games were really expensive. Outside of Super Mario 64, there was only one other game available in the U.S. when the system first hit shelves: Pilotwings 64. This shouldn't come as a huge surprise: Super Mario 64 is the bestselling game on the Nintendo 64—by a lot.