Adrenaline

Adrenaline is a power-up system that is part of UT2003, UT2004, Unreal Championship, and Unreal Championship 2.

UT2003, UT2004, and UC
Adrenaline can be collected by picking up adrenaline pills scattered throughout the arenas, or by achieving certain goals, such as killing opponents and capturing flags. It was originally thought of to allow breaking through stalemates in team-based games.

In UT2003 pills give the player 3 Adrenaline points, whereas in UT2004 they give the player 2. Adrenaline doesn't feature in Onslaught and Assault. Because Adrenaline adds a certain amount of randomness it is often manually disabled in competitive games. A notable exception is TAM, where adrenaline is a key part of the strategy.

Once 100 Adrenaline points have been collected, the player can start an "adrenaline rush" by quickly executing a sequence of movement keys. This rush will give the player an advantage, but only for a limited amount of time. If the player carries the flag or bomb in the relevant gametypes, the amount is shortened.

Combos
Below is a list of combos showing the key sequence needed, an estimate of the amount of time the rush lasts in seconds, and the result of the combo. "Pint-sized!" and "Camouflaged!" are additional combos than become available through official mutators.


 * ↑ ↑ ↑ ↑ Speed - (18) - Move faster, jump higher, drawing yellow tracks with your feet. In UT2004 this combo lasts half as long as most.
 * ↓ ↓ ↓ ↓ Booster - (27) - (Re)generate health up to 199%, then shield up to 150%, by 5 points per second or so. The player will emit green crosses.
 * → → ← ← Invisibility (27) - Turn invisible, albeit it with some shimmering effect
 * ↑ ↑ ↓ ↓ Berserk (27) - Increases rate of fire and knockback, including that of the Shield Gun, allowing its user to jump much higher with it. Three orange lines revolve around the player.
 * ← ← ← ← Pint-sized! (27) - Become half as big; disables crouching.
 * → → → → Camouflaged! (40.5) - Projects a, usually very conspicuous, holographic object around the player. The object depends on the static meshes used in the map.

Unreal Championship 2
The Adrenaline system was rethought for Unreal Championship 2, and plays a much more important role. The different characters have different kinds of "rushes" available to them, partly dependent on the character's race.