Have you still not found occasion to join the struggle against the zombie apocalypse in Valve"s Left 4 Dead? Well now"s as good a time as any to take part, as Valve is offering a 40 percent weekend discount for the game on Steam.

For Saturday and Sunday only, you can download Left 4 Dead for the PC for $23.99, rather than its usual price of $39.99. This follows the 24-hour free demo period Valve held for the game on Friday, so if you had a taste and liked what you played, here"s your chance to play it some more for a low price.

If you haven"t tried the game out, read our review to see why this is a deal you might want to take up. Those zombies aren"t going to blow their own brains out, after all.