Jigsaw puzzle based on the werewars card game.
left click and drag to another piece that looks like they might fit together, if they do they will snap in place. Use the mouse wheel while a piece is selected to rotate the piece. Type different numbers into the bottom right then hit start to change the puzzle size.
A context menu should be shown when right-clicking or, on touch devices, long-pressing in the game. This menu especially allows to play in full screen and control the volume.