https://www.polygon.com/2018/2/22/17036748/half-life-final-fantasy-xv-windows-edition-pc-steam

Final Fantasy 15 Windows Edition will launch on March 6, and Square Enix announced that there are several bonuses available to buyers, depending on which storefront they purchase the game from. These bonuses are generally of the standard “extra costumes and power-up” — but for Steam users, one of those extra costumes happens to be based on Half-Life star Gordon Freeman.

The Half-Life pack will be available for free to anyone who buys Final Fantasy 15 off Steam before May 1, Square Enix said. Gordon Freeman’s iconic suit isn’t only available for Noctis to wear in the main campaign; players can also equip their customizable characters from the multiplayer expansion Comrades with the accompanying glasses and crowbar.