The title sums it up pretty well, but if you still need convincing: A 4-player co-op run-n-gun action shooter that throws you into a tidal wave of degenerate robots with an array of weaponry that would make any mama proud. A classic 2.5D side-scrolling shooter, revitalized with modern game design.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.