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Glitches

Melee cancel

You can cancel out the punching cooldown by crouching after the attack, therefore being able to perform multiple punches in a very short time span. Works on any version.

Skip reloading

If you holster your weapon or swap to another weapon and then pull it back out, its ammo clip will be full without having to reload. Works on version 1.04 and lower.

Climbing people

Normally you're only able to stand on people's heads without being able to jump from them. A way around that is to first glitch into them by simply walking at the right angle, then spamming jump. At some point the game throws you out of the person you glitched into with a full jump. Works on any version.

Object boosting

Most decorative objects are solid, meaning you can stand and jump off of them. By using explosives or firing at them while having slow-motion activated, you'll be able to boost yourself to great heights. However, if the object is moving too fast then you won't be able to jump on it, you'll just clip through. This means that most smaller objects are not suitable since their weight is so light, meaning they will traverse much quicker than for example cardboard boxes or trash cans. Works on any version.

CROUCH GLITCH

If you want to move at running speed in areas through which you could fit only by crouching - do this: run up to eg a tunnel's entrance, MAKE SURE YOUR SPEED = 0 IN EVERY DIRECTION, crouch, now release crouch FIRST and start moving towards the tunnel. Nothing more to it.

LADDER GLITCH

If you want to get out of bounds easily, and you're playing version (up to) 1.03, then the ladder glitch is the way to go. This only works when you're at the top of a ladder. Grab it, immediately after pressing the action button - press jump. Your guy will be doing his usual getting on the ladder move, but he won't be getting onto the ladder - he'll be sinking through the floor. Considering that you can move on the edge of each room, jump into nearby areas, and get back into the intended playing area freely - a glitch like that becomes a tasty treat for every speedrunner.

WALL CLIMBING

You can climb certain types of walls, pillars, or whatever, in the same manner you can climb people. Basically the wall has to be curved - that's it. There's really no rule to which walls can be climbed and which can't. I managed to ascend seemingly flat walls and thin poles, so it's pretty much a matter of trial and error.

CORNER CLIPPING

You can clip into certain objects like boxes and stuff like that with this glitch. Stand on one of the corners of an object and start spamming crouch. If you positioned yourself right, you should fall through. Now walk slowly and after each step crouch a couple of times. If you go far enough into the object you can move freely. If you simply start running around after jsut spamming crouch at the corner, you'll get ejected. Thanks to this glitch, the vault activation skip on 9-2 is possible - which btw is the most awesome sequence break I did while speedrunning. Ever. Period.