Strike Suit Zero is an action-packed arcade space shooter set in the final hours of a future Earth. The clock is ticking; your planet is about to be destroyed and its only hope is the Strike Suit — an advanced, transforming spacecraft that empowers you with ludicrous firepower and awesome abilities. Every second is precious; you'll be forced to fight with fury, choose targets on instinct and make snap decisions that will not only affect the outcome of your mission but your path through the game and the ultimate destiny of seven billion lives.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.