Jigsaw puzzles typically come in 300-piece, 500-piece, 750-piece, and 1000-piece sizes, however the largest commercial puzzle has 32,256 pieces and spans 544 cm by 192 cm. The most common layout for a thousand-piece puzzle is 38 pieces by 27 pieces, for a total count of 1,026 pieces. The majority of 500-piece puzzles are 27 pieces by 19 pieces. Children's jigsaw puzzles come in a great variety of sizes, rated by the number of pieces. A few puzzles are made double-sided, so that they can be solved from either side. This adds a level of complexity, because it cannot be certain that the correct side of the piece is being viewed and assembled with the other pieces.
There are also Family Puzzles, which come in 400-piece with three different sized pieces from large to small. The pieces are placed from large to small going in one direction or towards the middle of the puzzle. This allows a family or puzzlers of different skill levels and different size hands to work on the puzzle at the same time.
There are also three-dimensional jigsaw puzzles. Many of these are made of wood or styrofoam and require the puzzle to be solved in a certain order; some pieces will not fit in if others are already in place. Also common are puzzle boxes: simple three-dimensional jigsaw puzzles with a small drawer or box in the center for storage.
Another type of jigsaw puzzle, which is considered a 3-D puzzle, is a puzzle globe. However like a 2-D puzzle, a globe puzzle is often made of cardboard and the assembled pieces form a single layer. But mainly like a 3-D puzzle, the final form is a three-dimensional shape. Most globe puzzles have designs representing spherical shapes such as the Earth, the Moon, and historical globes of the Earth.
There are also computer versions of jigsaw puzzles , which have the advantages of requiring zero cleanup as well as no risk of losing any pieces. You can download such games for your PC and even cell phones or play them online on sites like the one you're on right now. On DailyJigsawPuzzles.net we add new jigsaws daily and you can choose your difficulty level with one click, save your games, earn points and compete other online players for free.[Source]