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