Orcs Must Die! Unchained is the third chapter of the same series of video games created by Robot Entertainment, a particularly free to play MOBA where in addition to the typical mechanics of the Multiplayer Online Battle Arena we can find elements related to the Tower Defense games. In a fantasy world populated by heroes and creatures of all kinds, players can form two teams and defy themselves in an attempt to destroy the opponent base, placing traps to hinder enemy advancement and evoking multiple troops through the use of special collectable cards. The game offers both PvE and PvP contents.