Includes two copies of ibb & obb - Send the extra copy to a friend. Additional copy will be placed in your Steam Inventory. ibb & obb is a two player cooperative game set in a puzzle filled world where gravity goes both up and down. You can only succeed by working closely together. Find a friend for some true local co-op couch fun or match up online. Fall up and jump down through 15 levels filled with double gravity puzzles and discover 8 hidden worlds that will test your new non-Newtonian skills to the maximum. All levels have their own unique music, composed by Kettel, known for his warm melodic electronica. Features Local and online co-op Warm electronic soundtrack by Kettel Steam achievements, leaderboards, multiplayer, cloud saving and trading cards Secret levels that will test your skills to the max

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.