From the rules: Blue is from the series Factor-5 and is the first jigsaw in which you can compete against other players. You must quickly find suitable pieces to make the jigsaw and then swap the pieces which are the wrong color - you will be surprised by how many possibilities there are. The game consists of 5 nearly identical jigsaw puzzles of 48 pieces each. There are multiple objects in the picture on the puzzle which are different on each board. All the pieces are then mixed together. Players race to complete the puzzle gaining points for first, second etc. In the second part of the game, players swap pieces to correct errors subtracting incorrect pieces from your score.