You can add any games you own, whether it was purchased from Macgamestore.com or somewhere else, to My Games within Mac Games Arcade by following these simple steps.

1) Go to My Games.

2) While in My Games, simply drag and drop your game from your Applications folder and drag it into the My Games window. Mac Games Arcade will automatically add the game to My Games.

For a more detailed install, click on the + sign in the bottom left corner of the screen. A new dialog window will pop up. Here you can Add the title, genre, and browse to the game's location.