Glitchless is a community made category of the game that removes the most major glitches to make the rules very simple, make the runs still relatively fast, and to make the category more enjoyable. If you want to run the game as intended, you're going to want to do a speedrun of "True Glitchless".

Puke104's console True Glitchless run (world record right now as far as I am aware):

Rules for True Glitchless: http://pastebin.com/Rc8gQjX9

This category was made to play the game 100% as intended. No one runs it really because it's slow, not fun, and difficult to not break the rules.