Horn is an action-adventure game. The player takes control of Horn, a young boy who mysteriously wakes up one day inside of an abandoned tower to find that every animal and person in his world has been turned into robotic behemoths known as Pygon. Horn must figure out why this curse occurred and set things right.

The player controls Horn by simply tapping the place in the world where he/she wants him to go. The game is not on-rails: the player has freedom to explore around each area and check for hidden crystals. These crystals can be used to upgrade Horn's weaponry and equipment, as well as to purchase potions and other goodies. In addition, Horn can hit certain enemies with his crossbow, which will net him extra crystals. He also uses the crossbow as a hook shot to reach specially marked places, which often house even more crystals.

When Horn comes across an enemy to fight, the game's controls switches to a simple combat interface. Swiping the screen will make Horn swing his weapon in the same direction. Dodge buttons on the left and right sides of the screen allow Horn to roll around the enemy. The player can use this to his advantage. Many enemies have weak spots which mus be found and hit to cause the best damage to an enemy.

The game's graphics, powered by Unreal Engine 3, are geared towards high-end mobile devices.

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