"The game, initially developed as a joke prototype from an internal game jam and shown in an early alpha state in YouTube videos, was met with excitement and attention, prompting the studio to build the game into a releasable state while still retaining various non-breaking bugs and glitches to maintain the game's entertainment value."
In addition, there's the Super Mario 64 0x A Button challenge, an effort to beat the game while avoiding the use of its main mechanic. It's not a speedrun, but the themes of exploiting every glitch possible is the same. It's also the source of the infamous "0.5x A Presses" video. https://www.youtube.com/watch?v=kpk2tdsPh0A
You can launch yourself into the air (100s of feet), run inside a dumpster to move it, drop through the floor to start falling from the sky, booby-trap a trashcan so it flies out of no-where and hit you upside the head, walk up an invisible ramp... it's fun.
Also this sub that highlights small, easy to overlook game details: https://www.reddit.com/r/GamingDetails/
https://kotaku.com/guy-beats-fallout-4-without-killing-anyon...