This key is a few months old, and thus am not sure if the key is still valid. I will return the favor if it isn't, just contact me.

http://store.steampowered.com/app/242880/
Sir, You Are Being Hunted is a freedom sandbox stealth experience, where each playthrough is unique, thanks to our British Countryside Generator. Escape from these robot-infested islands with violence, trickery and stealth. This brutally funny game is available for Windows, OSX, and Linux.

Drops 3 out of 5 trading cards
Developer: Big Robot Ltd.
Publisher: Big Robot Ltd.
Genre: Stealth/Survival
Themes: British/Robots/Atmospheric