I thought this rather beautiful altar frontal from Bradford Cathedral would make an engaging jigsaw - it is a little tricky! However, sadly, this is not going to work for Mac users. Instructions: Click here next Click Open, then click the .EXE file name and click Run, when you see the jigsaw puzzle, click Play Too many pieces? Try clicking on Trays on the top tool bar to create any number of resizeable trays to sort your pieces ........ you can also click the Cheat button and watch the puzzle solve itself! The software is by David Gray designer of Jigsaws Galore - the powerful jigsaw player and creator for Windows.