The Luck skill determines the quantity and quality of loot and gold dropped by slain foes. The more SP and the faster rate it can recover allow longer chains of attacks. While the player has a standard health bar, the skill points forms another (SP bar) that when the player performs an attack or uses magic, their SP becomes depleted and recovers when nothing is performed, so the player will be unable to attack if there isn't enough SP at that moment of use. Levels are also generated at random, with differing paths and amount of foes between each (while foes are still confined to certain areas) and destructible environments with the use of heavier weapons. Higher-level players will also be able to wield better weapons and armour and allow more options for magic use. Each time the player levels up they receive a given number of experience points to boost their overall health, skill points and luck. As the player progresses with each kill, they gain experience that eventually leads to gaining a level, the maximum being level 120.

Much of the gameplay revolves around close quarter combat with multiple AI controlled opponents throughout each level.

Unlike the previous instalments in the Kingdom Under Fire series, Circle of Doom is entirely a hack and slash role-play, much in the vein of dungeon crawlers and focuses entirely on the player's chosen character out of five (sixth can be unlocked), thus lacking the real-time strategy formula of the previous games.

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