These sets include real life photographic images of animals involved in different environments and situations. A strong, durable, quality product that can be used in a group setting, with discussion or as a progressive challenge. Make one puzzle at a time or if you really want a challenge, mix all 8 together and see how long it takes to complete. Each set includes 8 puzzles. 2 x 9 pieces, 2 x 12 pieces, 2 x 15 pieces & 2 x 18 pieces.