Masterspace is a game about mining, creating and exploring, featuring fully destructible environments and spaceships that allow you to travel between different planets. Use explosives to mine metal ores or watch your newly constructed home get smashed to pieces by a meteorite impact. As you venture into space to discover new planets, the hull integrity of your custom built spaceship will be tested.Go to: http://store.steampowered.com/ and download STEAM client
Click “Install Steam” (from the upper right corner)
Install and start application, login with your Account name and Password (create one if you don’t have).
Please follow these instructions to activate a new retail purchase on Steam:
Launch Steam and log into your Steam account.
Click the Games Menu.
Choose Activate a Product on Steam…
Follow the onscreen instructions to complete the process.
After successful code verification go to the “MY GAMES” tab and start downloading.