For today only - that's Sunday, December 4th 2011 - you can snag Dungeon Defenders for only $3.75 on Steam. Better yet, you can snag the 4 pack of the game for only $11.24 netting you three copies plus one free copy for poor friend! The DLC is also on sale for $75% making it only $1.25 for the New Heroes DLC which includes the new 8-player co-op mode!
Dungeon Defenders is a 4 player co-op (or 8), strategy/RPG/tower defense game. Players choose from different classes of characters, spawn in traps, and fight off waves of monsters with friends while defending their dungeon crystal. The game is a solid co-op experience, so much so, we gave it a 5 out of 5 for our review.
We highly recommend picking this up, not only because it's a great co-op game, but because we'll be having a community co-op night featuring it later this month. Sweet!