Team Fortress 2 just had its 16th anniversary, with Tuesday, October 10 marking more than a decade and a half since Valve first released the superlative shooter sequel onto Steam in 2007. In that time we've seen Portal, Left 4 Dead, Half-Life Alyx, and both CSGO and Counter-Strike 2, but TF2 remains one of the best small-team, class-based FPS games in the world. And now, a whole new mode has been added to the official rotation. Long-time Valve and Source game fans might remember Zombie Panic, the classic Half-Life 2 mod that casts one team as the undead and one side as the survivors. In the latest Team Fortress 2 update for Halloween, better known as Scream Fortress, it feels like Zombie Panic is back. Welcome to Zombie Infection.

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