39 Days to Mars

Embark on the 19th century's most unreliable spaceship in this 2 player couch co-op adventure. 39 Days to Mars is a unique game designed to be played with a friend, where both players have important roles in the expedition. Solo players are aided by the computer-controlled ship's cat.

Region: Global. Check that the key's region matches your Steam account's country before buying — region-locked keys can't be activated elsewhere.

What you get: one unique, unused product key, shown on your order page (and in your account) once payment is confirmed — usually within minutes, and at most 24 hours. No physical item is shipped.

How to activate: open the Steam client, choose Games → Activate a Product on Steam, accept the subscriber agreement and paste your key. The game then appears in your library, ready to download.

Requirements: a Steam account and the Steam client. System requirements are set by the publisher and listed on the game's Steam store page.