The big digital PC gaming storefronts all have Mac clients. Some game developers are more cross-platform than others - for example, all of Valve’s own games on Steam and Blizzard’s games on support Mac. These days, many of the games you already own probably have Mac versions available. When the rare game was ported to Mac, you’d have to purchase the Mac-only version to run it on your Mac.

In the old days, you’d have to look elsewhere for Mac games. Like Linux, Mac OS X has gained more and more PC gaming support over the years.