The Horus Heresy: Drop Assault is a strategy game for Android developed by Complex Games Inc. It is the first-ever video game based on the Horus Heresy setting of Warhammer 40,000. The game has a civil war theme, and you can choose your side, either the Emperor as a Loyalist or Horus as a Traitor. As a Captain of your troops, you can customize your army and engage in fierce tactical battles. You can create a Chapter with your friends and challenge rivals worldwide in Live Skirmish combat.

The game features four popular Horus Heresy Legions, including Emperor's Children, Death Guard, World Eaters, or Sons of Horus, each with a unique bonus. The game has fast-paced tactical combat and dynamic bonus missions that ensure each epic battle is unique. You can also customize your base and defense among the visually stunning ruins of The Horus Heresy setting in the Warhammer 40,000 universe. The game is entirely free-to-play, but some in-game items may be purchased with real-world currency. The game requires an Internet connection.