The listing, Super Motherload - Steam Key has ended.
Set on Mars in an alternate Cold-War era, Super Motherload is a 1 to 4-player couch co-op digging adventure with storyline by Image Comics' Kurtis Wiebe, a fully voiced cast of Soviet and American characters, and a procedurally-generated world that changes each time you play. Purchase powerful upgrades and supplies for your mining pod as you progress and prosper, as well as rare Specials Abilities with random availability.
You, the player, work for Solarus Corporation, an inter-planetary mining operation that has developed the infrastructure needed to harvest the precious resources of Mars to meet demand back on Earth. Soon after being dropped on Mars, you begin to discover that things aren't quite as they seem.
Here is a steam copy for the game "Super Motherload" :
http://store.steampowered.com/app/269110/
All you need to do after receiving the key is :
1- Open your steam and sign-in.
2- Go to the games menu in the top of the screen you will find "Activate a steam product".
3- Follow the instructions then enter the key to activate the game.
4- Install the game.
5- Enjoy it.
Please note that if you use the key and activate the game through steam, you can't ask for a refund.