Challenges

Challenges are in-game objective first featured in Halo: Reach and then reappeared in Halo 4. After completing a challenge's requirements, a designated amount of credits or experiences points are rewarded to the player. Challenges are one of the main methods of gaining experience points for the player to rise up in their in-game ranks.

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 two daily challenges, two weekly challenges, and one monthly challenge.