Valve has announced a new game mode for Team Fortress 2.

Mann vs Machine is a co-op survival mode that “lets you and five friends wage a desperate battle to stop a lethal horde of robots from deploying a bomb in one of Mann Co.’s many strongholds”, according to the TF2 developer.

Hints regarding the existence of the mode’s enemy, the robotic Gray, had been slowly released by Valve over the past two years.

The Gray have a number of specialised robots within their ranks including melee units Steel Gauntlet and Heavyweight Champ; the sword-wielding, sprinting Demoknight; two classes of medic and sniper; and a scout.

Giant robots and sentry-busting bombs-on-legs will also feature.

More information on the Gray is available on Valve’s TF2 website.

As with most wave-based survival games, breaks between attacks will give players time to upgrade abilities and weapons, with longer survival equating to better loot drops.

It appears that one map—The Mannworks Quicklime Factory—will be playable at launch, with more to come later.

Mann vs Machine mode in TF2 will be playable from tomorrow on.