Find a friend for some true local co-op couch fun or match up online.
Includes two copies of ibb & obb - Send the extra copy to a friend. ibb & obb - Best Friends Forever Double Pack Steam CD Key Additional copy will be placed in your Steam Inventory. 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 sk.