SilverQuest: Gaiden is retro dungeon crawling at it's best. FM Synth sounds and music bring you deep into a world of dungeon exploration where each game is a new experience! All art, music, items, enemies … everything is exposed outside of the game, meaning anyone can add, remove or change anything in the game. Add color, release your own mod-pack, anything!
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.