Features ARCADE MODE (MAIN MISSION):Play the arcade version of “METAL SLUG 3” from the beginning, and explore 5 immense challenging stages featuring multiple branching paths to explore exciting new areas! Make your way through the deluge of fire and fight off gigantic boss characters! MISSION MODE (STAGE SELECT):Play your favorite stages at will and train alone or with a brother-in-arms on the missions you have unlocked so far! ONLINE MISSION (ONLINE MULTIPLAYER):Connect to Steam and clear missions with friends far away via Online Co-Op Play. Find a fellow countryman or foreign ally and let the mission begin! SETTINGS:Configure display, control, and language settings. GALLERY:View original illustrations of the game that you've unlocked. LEADERBOARDSCheck your current rank and score in“METAL SLUG 3” at any time, and compete with other players to become the world's No. 1 soldier!

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.