The Orcs have invaded Steam! Slay them with the demo of Orcs Must Die ! Spotted on RPS ! The full game is out next Wednesday October 12, which gives us days and days to practice planting traps and crossbow-blasting streams of green fools. There's 995 MB worth of Orcs to kill, and a pleasing variety of traps with which to do it. See a few of them in action in the interactive Orcs Must Die! trailer. You can pre-order the full version on Steam now at a discount and some shiny pre-order armour, which comes with a great big hammer. For killing Orcs, you understand.