Epsilon is a secret community. There are a lot of mysteries and legends about it. You was kidnapped and they kept you in their secret laboratory. But you have the chance to escape and figure out what's going on. No one was so close to unlocking.
Complete checkout — your code lands in your inbox in ~30 seconds, and is always available under Orders in your Gameplug account.
In the desktop client: top-left menu "Games" → "Activate a Product on Steam…" (or use the web link below).
Paste the key (format XXXXX-XXXXX-XXXXX) and accept the Steam Subscriber Agreement.
The game joins your library permanently — install it on any machine you sign in to.
Code not working? Contact support — confirmed-invalid codes are replaced or refunded.