Buy Halo Wars: Definitive Edition

For Steam CD Keys, you must download (HERE), install the Steam software and create a new account. If you already have a Steam account, once you log in, click "Add a game" (located in the bottom left corner), and then "Activate a Product on Steam". After a few more clicks, you will be prompted to type in your game code. Thus, the game will be activated and automatically added to your account library.

Use your code on the Xbox Live network to activate your games or increase your Xbox Live account's credit. To access the Xbox Live network, you need the Xbox One, a broadband connexion, a Xbox Live account, and a storage device according to your console: Hard disk drive, memory card, or USB drive.

Play Anywhere games can be played on your PC and your Xbox. You will need to have installed the Windows 10 Anniversary Edition update on your PC, as well as the latest update on your Xbox One console. You only have to log into your Xbox Live/Microsoft account and your Xbox Play Anywhere games will be available to download. On your Xbox One, games will show as "Ready to Install" under "My Games and Apps". On your Windows 10 PC, games will appear in "My Library."