SirPrimalform: What is it about glitches and sequence breaking that makes LttP and MM stand out for you?
For aLttP, here's the thing:
A sizable portion of the game is normally quite linear. In the Light World, you have to beat the first dungeon before you can access the second, and you have to get the item in the second dungeon to access the third. Those three dungeons all need to be completed to reach the dungeon whose clearing allows full access to the Dark World. Even in the Dark World, you still have to get the item in Level 1 before the game finally opens up.
With glitches, in particular the Exploration Glitch, the game is broken wide open from the beginning; no longer do you have to do the earlier part of the game in the order the developers intended. This opens tons of possibilities. In particular, it allows for some interesting self-imposed challenges, where I try to get everything possible with one significant restriction. For example (these are two different challenges):
* The rain, which normally stops once you escape with the princess at the beginning of the game, must continue; get everything possible while it's still raining. This creates some interesting situations with respect to overworld sprites; light world has none, while dark world has the ones that are normally found in the light world.
* The moon pearl, which prevents you from turning into a bunny every time you enter the dark world, is forbidden. Get everything that is possible to get without getting the moon pearl.