Wizardry: Proving Grounds of the Mad Overlord is an early role-playing game that was developed for the Apple II and was ported to numerous systems, including the Commodore 64, PC-98, NES, and Game Boy Color. It later received a remake for modern PCs and the Nintendo Switch. Being one of the first role-playihg video games, it codified many of the mechanics and tropes that are well known in the genre. You create a party of customized characters and from there you explore a dungeon in search of treasures and an evil wizard named Werdna, whose amulet you seek.

For this run, TaoTao opts to break the game into pieces by creating a custom hero, carefully resetting the game multiple times, and creating another hero in-between resets using subframe inputs. By doing this, they corrupt the memory and save data in such a way that with the right subsequent inputs, the game is tricked into believing that the player already has Werdna's amulet. For further details, you can read their author's notes.