Play as all 9 TF2 mercs in the GMod sandbox
How to join The host picks "Start New Game", a map and 2 or more players, leaves "Local Server" unticked, ticks "Peer-To-Peer" and picks "Start Game"; friends right-click the host in their Steam friends list and join. Everyone playing needs this mashup from Melty.
Play as all 9 TF2 mercs inside Garry's Mod sandbox — with your physgun and toolgun still in hand.
Pick a class from Utilities → TF2 Mercs (or !class), get its look, HP and speed plus a stock-style weapon and its signature move: Scout double-jump, Soldier rocket jumps, Pyro airblast, Demo charge, Heavy spin-up, Engineer mini-dispenser, Medic heal beam and Uber, Sniper charged headshots, Spy cloak and backstabs.
TF2's merc models and stock maps load from your own TF2 install when it's mounted — nothing from TF2 is bundled. Your own Workshop subscriptions keep working.
Host a normal GMod sandbox server and friends join as mercs with you. (v1.1.0 feel revamp, untested in a live game yet.)