Power-up

"Power-ups" give you an advantage over the other players in a multiplayer battle in Halo: Combat Evolved, Halo 2 and Halo 3. On a few occasions, they're also found in Campaign. You activate them by walking into them and, unlike Equipment, which is not activated instantly and can be held for use later.

Trivia

 * The Custom Powerup's default settings increase your speed and melee power. It has been speculated this was to be the effects of a unused Agility Powerup.
 * There is a powerup found in Halo CE's data files, called double speed. It was possibly deleted, but never removed from the game's memory. It increases the player's walking speed and slows down all AI bots and projectiles. It is buggy though, it doesn't de-activate until the player enters another bsp, and while activated the player is unable to open automatic doors.