The most famous example of this is the minus world, but I find most older games have this glitch. Where the hex byte(s) support warping to more levels that exist in the game, you can warp to glitchy levels.
And there’s also those games where if you are able to go out of bounds enough, you can be met with a scrambled mess of blocks and enemies. Example: https://i.imgur.com/rjiKEmv.png
But why does all this happen? I know why you can access them, but what code in these games loads all of these glitchy levels and blocks rather than it going to a black screen?
In: Technology
Especially in older consoles, the code is written very compactly, with little extra space for extra information.
So, if something is done to overflow an expected value beyond it’s bounds, it creates unexpected results elsewhere, like changing sprites to the wrong location.
In Pokemon (GBA), if you name yourself certain ways and fly from one specific area to another, it spawns Pokemon that shouldn’t even exist, like MissingNo, because it uses the name data where there should be a list of available Pokemon to catch.
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