Loved playing Civ. III on my old PC when it first came out in 2001. Was excited about this download since Civ. IV and V have been a disappointment to me. Read the many reviews on Amazon indicating that people have had problems with keys and/or getting the game to run on their Mac. Went to GameAgent.com to use "Mac Match" to ensure that the game would run on my mini (10.7.5, Intel Core i5, 2 cores, 2.3GHz, 4GB Memory, 500 GB HD, Intel Graphics 3000 384 MB). Not a powerful computer by any means, but was thrilled to see all the green check marks and the exuberant report: "Will Run! Awesome! This game will definitely run on your Mac mini." Nope. Despite three successive installs, I didn't even get to find out if my key works. More like "Civ. III Complete Waste of $$$." I actually downloaded it from GameAgent.com, but doubt purchasing from Amazon would have made a difference. Caveat emptor. I guess my plans for global domination will have to wait until I find an old PC and dig out my original software.