TASs primarily use slow-down (sometimes playing the game frame-by-frame) and save-states (saving and reloading at any point) to play the game as perfectly as possible. Glitches are often abused, but hacks are not (with some exceptions, such as a hack for Knuckles in Sonic 1). They are not intended to show gaming skill in the same was a normal speedrun does, but it does take a lot of skill and effort to make a TAS.
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