Super Mario 64 · Nintendo 64 · Position overflow exploitation (TAS-only) · Saves: None — it costs 12+ hours to save a single button press · Documented: 2016
By accelerating Mario to speeds so extreme that his position value overflows, players can reach "parallel universes" — copies of the level existing outside the map — in order to complete a star using only half of an A-press.
Super Mario 64 stores Mario's position as a number, and like all such numbers it has limits. If Mario moves fast enough in a single frame, his position value overflows and wraps around, placing him at a location far outside the intended map — a region the community calls a parallel universe, or PU. These are not new areas but arithmetic ghosts: the game's collision detection still functions there, so Mario can stand on floors that exist only as a mathematical echo of the real level. Critically, reaching a PU requires quadrupling the effect, because the engine checks Mario's hitbox four times during a single movement. The community therefore speaks of Quadruple Parallel Universes (QPUs), and travelling between them demands speeds so absurd that they cannot be reached by ordinary play. Building that speed means exploiting a glitch repeatedly, frame by frame, for an extraordinarily long time. The technique achieved fame through the Super Mario 64 researcher pannenkoek2012, whose work centres on an unusual challenge: completing the game's stars using as few presses of the A button as possible. On 12 January 2016 he uploaded a commentated video, "SM64 – Watch for Rolling Rocks – 0.5x A Presses," explaining how a star could be obtained in half an A-press — the "half" arising because the press is held over from an earlier action rather than initiated fresh. The strategy took 14.8 hours from start to finish in a tool-assisted superplay, roughly twelve of which were spent building Mario's speed to the point where PU travel became possible. The video went viral, spreading from 4chan's video game board and beyond, propelled by the surreal spectacle of a man explaining, with total scholarly seriousness, that "first, we need to talk about parallel universes." It became one of gaming's most famous pieces of technical folklore. It is worth stressing that this is not a speedrun technique in any practical sense — it costs half a day to save a single button press — but it is perhaps the purest example of a community reverse-engineering a game so deeply that it discovers spaces its creators never knew existed.
Super Mario 64 tracks Mario's position as a numeric value with finite limits. Push his speed high enough and, in a single frame, that value overflows and wraps around, depositing him at coordinates far outside the level as designed. The game does not know anything is wrong: collision detection keeps working, so Mario can land on floors that exist only as arithmetic echoes of the real map. Because the engine validates his hitbox four separate times during each movement, meaningful travel requires reaching a Quadruple Parallel Universe — a demand so extreme that the necessary speed cannot be built through normal play, only by exploiting a glitch repeatedly for hours on end.
The technique became famous through pannenkoek2012, whose Super Mario 64 research pursues a peculiar goal: completing stars with the fewest possible presses of the A button. A press can count as "half" when it is held over from a prior action rather than initiated anew — and on 12 January 2016 he published a commentated video showing how the star in "Watch for Rolling Rocks" could be obtained in half an A-press, using parallel universe travel to get there. The tool-assisted strategy ran 14.8 hours, roughly twelve of them spent simply accelerating Mario. The video went viral on the strength of its narrator's deadpan gravity — "first, we need to talk about parallel universes" — and became a permanent piece of gaming folklore, an emblem of a community that had reverse-engineered a game more thoroughly than its makers ever did.