NetPuzzle
About
NetPuzzle is a game that lets you build jigsaw puzzles solo or cooperatively online! Supports huge puzzles with thousands of pieces, user customizable artwork, and unique and realistic edge shapes!
Extract the zip into it's own folder and run NetPuzzle.exe
Be careful spawning very large puzzles! It can be hard on your PC! If the game won't open or you need to delete cached puzzle images, you can safely delete the autosave, settings, and cache files in C:\Users\YourName\AppData\Roaming\NetPuzzle