|First Appearance:||Captive Audience|
|Inhabitants:||Project Freelancer personnel|
- "What the hell is going on here?! No matches have been authorized for- No! Allison!"
- —Director in Three's a Crowd
The Freelancer training room is an arena that is located inside the Mother of Invention. In this room the Freelancers test their skills, spar with one another, and practice using their equipment. This room is notable for being the location where York obtained his eye injury.
The training room first appeared in the episode Captive Audience, where Tex is seen defeating York, Wyoming, and Maine in a sparring match. During this match, it's shown that the room has the ability to change its layout for specific exercises, as pillars are seen to appear and disappear. Also, it's shown in The New Kid that the room itself can bring out turrets to simulate a real firefight. Tables holding weapons can also rise out of the floor for Freelancers to use in matches, as seen in Three's a Crowd. In addition, the room also contains a spectator room, where others can watch the action from above. The room itself is run by F.I.L.S.S.
|Halo: CE Era: Blood Gulch • Sidewinder • Caboose's Mind • Battle Creek • Teleporter Nexus|
|Halo 2 Era: Great Burning Plains • UNSC Wind Power Facility • Great Swamp • Great Freezing Plains • Cities • Island Fortress • Underground Caves|
|Halo 3 Era: Valhalla (Hologram Chamber) • Rat's Nest • Outpost 48-A • Command (A.I. Containment Facility) •|
|CG Animation Era: A.I. Storage Unit • Angel On My Shoulder • Mother of Invention (Training Room) • Bjørndal Cryogenics Research Facility • Insurrection Building • UNSC Archives • UNSC Scrap Metal Recycling Station • Longshore Shipyards|
|Halo 4 Era: Chorus (Crash Site Bravo • Forest Base • Desert Refueling Station • New Republic Headquarters •|
Crash Site Alpha • Armonia • Radio Jammer Station 1C • Charon Research Complex 2C • Charon Excavation Site •
Jungle Temple • Temple of Procreation • Eastern Mountain Range • Communication Temple • Purge)
|Halo 5 Era: Retirement Moon • Armada 8 (Desert Gulch • Underwater Lair) • Earth|