The Pit takes place in a training area with both stationary and moving enemy and civilian targets popping up. The player begins the level with an M4A1 Carbine and a USP .45 (but can change weapons on the table at the beginning of the mission), and is tasked with charging through the level as fast as possible. There are 24 enemy targets to take out and 5 civilian targets to avoid. Simply hitting all enemy targets and getting to the end of the level will award the player with one star, regardless of how long it took them. Completing these objectives in 45 seconds and 35 seconds will reward the player with two stars and three stars respectively. If a civilian is hit, it will be impossible to obtain three stars.
Infinity Ward previously mentioned that one star would be awarded for completing a Special Ops mission on Regular, two stars for completing it on Hardened, and three stars for completing it on Veteran; however, this is untrue for this level, as there are no difficulty options available for it. Instead, the player's speed is the primary factor for the number of stars the player earns, with the Three-star award also requiring no civilian hits.
The player will not receive the Pit Boss achievement/trophy if they complete this mission in under 30 seconds, it must be done in the campaign.
If the player hipfires, Cpl. Dunn will yell "Stop firing from the hip! Aim down the sight," like in the campaign mission. Cpl. Dunn will also yell "Switching to your other weapon is faster than reloading!" if the player reloads during the run.