2 is a trap based action-tower defense video game developed by Robot Entertainment as the follow-up to the original Orcs Must Die!, with Microsoft Game Studios publishing the sequel for Microsoft Windows on July 30, 2012 in the United States.

As either the War Mage or Sorceress in the campaign mode, the player must attempt to defend one or more Rifts (up to 3) from an onslaught of orc armies that emerge from one or more doors in a given level.

Traps include those that are placed on ground, wall, or ceiling, which typically activate once and then require a short reset period before they are ready again; traps can also include Guardians, creatures that will act on their own like archers or knights, who can be injured and knocked down by the orcs until either the major respite between waves or by the player with special equipment.

The player can also fight directly using weapons from their Spellbook, including magical abilities that consume mana.

Players can heal by being near a Rift, collecting health or mana potions dropped by defeated orcs, or using special equipment.

Equipment can have benefits that apply to both players, such as an artifact that passively improves the speed of trap resets.

The game offers weekly challenges, typically restricting the players to one or two types of traps and equipment.

It is revealed that the War Mage's master had not died; he was still alive, and had opened a small, weak rift to allow the Sorceress to escape and battle the Mob together.

[2][16][17] The Digital Fix gave a score nine out of ten, praising the gameplay, graphics and the addition of co-op play.

[14] Metro UK gave the game a score of eight out of ten, giving praise to the gameplay and co-op mode, but criticized its random difficulty level and lack of visual upgrades.