Fall in line for fast, furious fire fights with Worms™ Blast. Your mission: launch your worm marine into hostile waters and blast your way to survival through intense puzzle action! Take the big chunk of puzzle-styled gameplay and slice into 60 fun-sized missions.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.