Imperium: Horizons is a standalone game that contains an astonishing fourteen unique civilizations, each of which makes for a unique and challenging opponent in a solo game. The game is fully compatible with Imperium: Classics and Imperium: Legends for players wanting to expand their pool of civilizations even further, and the game incorporates a new trade module that allows players to recreate all the intrigue, wealth generation, and dynamic politics of a thriving economy. It also contains over 45 cards reprinted from Classics and Legends for various minor balance and integration tweaks.