Challenges

Challenges are in-game objectives featured in Halo: Reach, Halo 4, and Halo: Spartan Assault. Completing a challenge's requirements awards the designated amount of credits or experiences points. Challenges are one of the main methods of gaining experience points for the player to rise up in their in-game ranks. Challenges are only available while connected to Xbox LIVE.

Halo: Reach
Halo: Reach challenges are separated into campaign challenges and multiplayer challenges. There are four daily challenges and one weekly challenge after every update. By completing challenges, players gain more credits and in turn rise up in ranks.

Halo 4
Halo 4 challenges are separated into campaign challenges, Spartan Ops challenges, and Matchmaking War Games challenges. Campaign and Spartan Ops are weekly challenges, while War Games challenges are separated into daily challenges, weekly challenges, and a monthly challenge.

Halo: Spartan Assault
Halo: Spartan Assault challenges (also called "Assault Ops") are only present in the campaign. There are three weekly challenges, and 90 permanent mission-specific challenges (three per mission). Completing challenges earns players XP.