Age of Empires III is a historical real-time-strategy (RTS) game developed by Microsoft's Ensemble Studios and MacSoft Games. AoE III is the third instalment of the Age of Empires series, and is based on the European colonization of the new world between the 15th century to the 19th century. The demo lets you play the first couple of levels of the single player campaign.
Mac OS X 10.3.9 or newer
Intel or PowerPC powered Mac (1.4 GHz or faster)
64MB 3D graphics card
Free download at softonic.com