The listing, Supraball (Steam Key) has ended.
For more information please follow this link: http://store.steampowered.com/app/321400/
Activation Details
1. Follow the link: http://store.steampowered.com/ and download STEAM client.
#If you are a new Steam user, click the “Create a new account” button to register a new account.
2. Click "Install Steam" (from the upper right corner)
3. Install and start application, login with your login credentials
4. Click the Games Menu inside Steam client
5. Choose Activate a Product on Steam
6. Follow the onscreen instructions to complete the process.