There's only so many ways you make a puzzle harder. Making it very small is one of them, and thats exactly what this jigsaw puzzle is. At 1000 pieces and a quarter of the size of a normal puzzle with this many pieces it will prove challenging to the most patient of puzzle enthusiasts. 

This A3 size puzzle of the Great Pyramids should keep you going for a while. It's also small and compact so you can take virtually anywhere.