Please note that from today until July 5, Halo 5: Guardians will be downloadable and playable for free by all users Live Gold, with the possibility of buying it 50% discount if you want to continue using it after that period. The free download is currently not active yet, but it will be the next hours: you can then go to the Store to download the game, provided with Gold account. Have fun!

Update : Aaron Greenberg has made it clear that the period of free game will start shortly after 23:00 (Italian time).