You can play Marathon for free for a whole week

The second season of the game has started with a ton of changes, a new leveling system, and duo squads.

The promotion will last until June 9th, inclusive.

Marathon on Steam

Explore the lost colony of Tau Ceti IV, scavenging valuable loot in a high-stakes survival first person shooter from the creators of Halo and Destiny.

store.steampowered.com