More unexpected Mario content: a 7-minute video speedrunning composite by FlibidyDibidy:

This video combines my first 5,162 attempts to speedrun Super Mario Bros. I recorded 193 hours of attempts (and practice) on an original 1985 Nintendo Entertainment System, then I wrote a custom computer program to process those videos and combine them via machine learning and conventional image processing techniques.

This is not just fun to look at, and – presumably – study as you’re speedrunning yourself. A sign of a good visualization is that it makes you see stuff that you haven’t before and here, at some point (after 1:42), you start noticing strange comb-like patterns in Mario running.

Turns out this is actually a thing called a “frame rule,” a quirk of game’s timing code where it only checks for a completion of the level every 21 frames, or one third of a second. That means that for every level after the first one, your start will be rounded up to the nearest 21st frame:

The analogy often given is to think of a bus that leaves every 21 frames, and levels can only end by getting on that bus, and so other than in the last level (which has no new level to load at the end of it), improvements in Super Mario Bros. can only happen in 21 frame increments. If you save a frame or two in a level, but it’s not enough to make the previous frame rule, it’s not enough to take the previous bus, you’ll just end up waiting for it to happen anyway.

Stay tuned to the end of the video for some fun stats, and click through in the description below to see the same tech applied live during an in-person speedrunning event.