Robot Entertainment announces that Orcs Must Die! 2 is now available on Steam, offering their sequel to last year's AIAS Strategy Game of the Year. Word is: "Orcs Must Die! 2 thrusts players and their friends back into battle against a terrifying mob of orcs and other monsters. With a redesigned spellbook, players will have a broader range of options to build a deadly arsenal of defenses. Investing hard-earned skulls in an enormous new upgrade system will allow players to cater to their favorite methods of burning, grinding, tossing, or dismembering orcs." A playable demo was released last week, and here's more, including a feature list:

Orcs Must Die! 2 begins days after the ending of the original game. With the rifts closed and the magical Order dead, the War Mage finds himself suddenly thrust into a new battle against the mindless orc mob. He has a powerful, if questionable, new companion in the Sorceress, an ex-War Mage responsible for the destruction of the Order.
Orcs Must Die! 2 Features:

• Co-Op! - Play as the War Mage, the headstrong hero who charges into danger, or play as the more strategic Sorceress who keeps the mob at bay with mind-control and magic.
• Story-based Campaign – Pick up where the original game left off with a brand new story-based campaign that you can play in Single-Player or Co-Op!
• Endless Mode - Play alone or join a friend to put your skills to the test against endless waves of increasingly difficult enemies.
• Classic Mode - Steam players who own the original Orcs Must Die! will automatically unlock co-op versions of 10 fan-favorite levels from the original game featuring new enemies!
• Over 20 Deadly Enemies - Face an army of vile new creatures like Earth Elementals, Trolls, and Bile Bats. And they’ve brought all of your favorite trap-fodder from the original Orcs Must Die! along with them!
• More than 50 Traps, Weapons, and Guardians – Choose from an enormous armory of new and classic defenses, including an all new assortment of magical trinkets.
• Massive Upgrade System – With more than 225 persistent trap and weapon upgrades to unlock, you can build an arsenal perfectly suited to your slaying style.