A closer look
If you think you're good at Mario, try being 'waiting for a 0.35-second bus' good. The original game operates on a 'framerule' system where levels only load at specific 21-frame intervals, much like a digital bus schedule. Speedrunners map out utterly flawless routes not to finish the level as fast as humanly possible, but merely to finish it just in time to catch the exact same invisible loading screen window as their rivals, making milliseconds of optimized movement absolutely crucial.
