"Power-ups" give you an advantage over the other players in a multiplayer battle in Halo: Combat Evolved, Halo 2, Halo 3 and Halo: Reach. On a few occasions, they can be found in Campaign, except Halo 3.
|Name of power up||Effect||Games Found In|
|Overshield||Energy shields' power is increased to twice as normal; thus it's more difficult to kill the user.||All Halo games in multiplayer and
all levels in Halo: Combat Evolved except for Halo
|Active camouflage||This makes the user invisible for 30 seconds. The user blends into their surroundings, making them more difficult to see.||All Halo Games on Multiplayer and in the Halo: Combat Evolved Campaign.|
|Custom Powerup||This is a powerup that can be placed in Forge and is only seen in Multiplayer. This powerup's effects can be customized by the player such as player speed, health, etc.||This is only on Halo 3 Multiplayer and Forge.|
|Sprint||This powerup increases player speed, and decreases speed of everything else. However, it is incredibly buggy, when activated the player cannot open automatic doors, and it doesn't turn off until the player enters another BSP.||Only found in Halo: Combat Evolved and Halo: Custom Edition's data files.|
|Full Spectrum Vision||This powerup can be found in Halo: Combat Evolved's coding on at least the multiplayer map Timberland. The effect of this powerup is unknown, possibly a countermeasure to Active camouflage.||Only found in Halo: Combat Evolved and Halo: Custom Edition's data files.|
- The Custom Powerup's default settings increase your speed and melee power. It has been speculated this was to be the effects of an unused Agility Powerup.