Tripwire Interactive's zombie shooter Killing Floor was first released over a year ago but this week the developer is offering its players a free expansion and a new paid downloadable expansion to the game via Steam. The free portion is the Incendiary Content Pack which adds a new weapon (the MAC-10) and four new multiplayer maps to the title. In addition the new paid DLC, the PostMortem Character Pack, adds four new playable characters to the game. Normally the DLC would be priced at $1.99 but it's on sale this weekend for just 99 cents.

Indeed Killing Floor itself is also on sale this weekend for just $9.99, a 50 percent price cut. The two previously released DLC expansions are also on sale for 50 percent off to just 99 cents each or you can get the full game plus all three DLC expansions for just $12.98.