Speculation for new robot-fighting mode with tower defense elements emerges from hidden assets.

The crazed red and blue mercenaries of Team Fortress 2 may soon have more to worry about than the other team of crazed mercenaries. Various hints spanning from 2010 to 2012 (many compiled in one handy location by Reddit users) point to a new mode which will pit the two teams against waves of robots.

The Engineer might not be the only mechanical mastermind in town.

"Mann vs. Machine," the rumored name for the update, was most recently indicated by a suspicious splatter mark appearing this week on the logo of Team Fortress' website. The splatter mark links to an image: a birth certificate which indicates the feuding brothers who founded the opposing RED and BLU teams had a third sibling named Gray, who was "absconded with" soon after birth.

Previous hidden assets on the Team Fortress 2 website and within the game's code have pointed to robotic variants of each of the game's nine distinct classes, which would theoretically compose the rank and file of the Gray team. Reddit users have speculated that references to waves as well as new deployable items for the engineer indicate the mode will have elements of tower defense.

Valve, the game's developer, recently debuted its final "Meet the Team" update for the Pyro class, and unveiled a new cross-promotional Team Fortress 2 map for the upcoming Sleeping Dogs today. Valve also has a history of promoting upcoming titles and features with elaborate alternate reality games.

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