A seasonal Team Fortress 2 PC update, dubbed The Third Annual Scream Fortress Very Scary Halloween Special, is up for download now.
As detailed on the game's official site, it offers a new Halloween-themed map, a boss fight with a giant eyeball called Monoculus, two new achievements, nine costume packs, a heap of new loot and plenty more besides.
It's only available until 6th November, so make haste.
On top of all the extra in-game content, Valve has also posted an accompanying comic strip. It's a hoot.