As promised Valve
has launched its 24 free play period for Left 4 Dead
, allowing anyone who hasn't bought the zombie co-op shooter to download the full game and play it for free until 7 pm ET on Friday. Again the full version includes the new Survival mode (and what do you know; we have a guide to that mode posted on our site today
In addition to the free 24 hour version, Left 4 Dead
can now be purchased and download for 40 percent off its normal price on Steam. Normally the game costs $39.99 but for the weekend only you can purchase the title for a mere $23.99.