"In this game players aim to complete a 3D animated picture of a Nintendo videogame by exchanging pieces with other players they meet over StreetPass or by getting a piece from a panel that they have already started with Play Coins. After the December 2011 update, new puzzles became available which included four pink squares in the centre. The pieces that belong in these spaces cannot be purchased with play coins. Some puzzles have more pieces than others, making them harder to complete." Source: Wikipedia, "Puzzle Swap", available under the CC-BY-SA License.