Gates of Troy is a single player expansion pack for Slitherine's Spartan. It adds six new missions, 17 new heroes, 12 new units and a number of features.

New additions include a zoomable campaign map, vassalization of foreign nations through diplomacy, new UI design and improved UI functionality, ability to build the Trojan Horse, numerous diplomacy improvements, AI improvements, improved auto resolution of battles, and extra mod features.

The new scenarios are: The Trojan Wars, The pass of Thermopylae, Greek Colonization, Pre-Historic Greece, The Ionian Revolt, and Grand Campaign with Rome and Persia.