Valve reveals that a playable demo for Left 4 Dead 2 is available for those who have pre-purchased the multiplayer shooter via Steam. If this is the case, you may pre-load the L4D 2 demo, which is due to launch for early access on Tuesday, October 27.

Early access to the L4D 2 demo is available for both retail (360, PC) and Steam (PC) customers. Those who pre-ordered via participating retailers should be able to pick up their early access codes this weekend and be ready to play on Tuesday when the demo launches.