A button combo is a sequence of buttons that, when pressed in order, results in the execution of an exploit. Typical button combos take advantage of unforeseen attributes of certain actions. Some actions, such as meleeing, can disrupt animations for firing and reloading weapons, performing melees, etc. By chaining these and other actions, players can perform special tricks, such as automatic Plasma Grenade sticks and instant close-range kills.



Reminder!
Button Combos only work in Halo 2 Classic and not in Halo 2 Anniversary

Also if you're trying to learn and master these inputs on M/KB, just keep in mind:
- X is now a mix between Reload and Action. Everything still works, but you might have 2 buttons for them, just press the button in context.
- Y is now whatever your Switch Weapons is.
- R is now whatever Shoot is.
- B is now whatever Melee is


Halo 2 Button Descriptions

X = The X button can cancel the timers of animations, such as melee or grenades (off-host), enabling you to fire or melee sooner than you would normally.

Y = The Y button can cancel reloading, cancel melee animations, and, when used in a quick double sequence, it can enable you to open fire again sooner after reloading.

B = The B button can cancel the reload timer by meleeing and pressing X afterward. The melee's lunge can also be used to swing at your opponent, after which you can snipe someone no-scoped or stick people with a plasma grenade.

L = The L button can be used to reload. After you have thrown a grenade, press X. You will automatically reload, but you can keep shooting while you reload (off-host).

Overheat mechanic:
Overheated plasma weapons have extra abilities. After a weapon overheats, it will reset the timers for shooting, meleeing and grenading; this can be used to get quick sessions of double grenades.



Button combo list / button sequence:

The BXR: Range Melee: you press these buttons in this order: B-X-R. As soon as your melee connects with the opponent in a meele situation, you want to hit X and then R as fast as you can. This will result in an instant kill.

The BXB: aka double melee. You want to hit B to melee your opponent, and as soon as the melee connects, you want to hit X and then B again. It will kill the opponent very quickly and is a good basic move.

RRX: Long Range. This is the Double Shot. If done effectively, you can out BR the enemy in half the time that it would take normally, and can virtually be unstoppable if well practiced. All you have to do is push the right trigger once, and as soon as the 3 bullets leave the BR, you press the righttrigger again, and then hit x right after. 6 bullets should leave the BR rapidly, and your gun should reload its ammo. What you want to do after you successfully complete a double shot, is hit Y twice. This will change your gun quickly back to the BR, while not reloading the gun. After that you can Double Shot again.

RRXYYRRX: Long Range. This is the Quad shot, its basically the doubleshot on steroids. Harder to pull of and needs years of practice to do constantly.