Four-Team

"Shoot at people whose army-navy-store cargo pants are a different color than yours" is a learned behavior by now, so we didn't think it would inconvenience you too much if we tracked down eighteen more color-coordinated psychopaths and put them on the payroll. Global Radio Network (GRN) and Yard Logistics Workers, Inc. (YLW) play a part in all the broadcast towers and freight yards you've been fighting over, respectively, but they've also got shady corporate interests that they're willing to hire mercenaries to protect. You're not so different after all!

Death & Taxes update page

Four-Team is a gamemode introduced in the Death and Taxes update; as the name suggests the gamemode features typical symmetrical gameplay, but players are now split between four teams instead of the usual two. These two new teams added are the GRN (Global Radio Network) team and the YLW (Yard Logistics Workers, Inc). Since teams will naturally be smaller in size, teamwork is encouraged and sticking together is advised.

So far, there are only two official maps that have four teams, Hydro and Flask; however two new maps featuring four teams have been teased in the 2.0.3 anniversary patch blog post.

Trivia

• The mechanics of a map having three or more teams first appeared in TFC, though in the base game only the Hunted map (which eventually evolved into VIP) utilized this mechanic. The Civilian was on Blue, Red was comprised of his bodyguards, and Yellow was the assassins.