Amazon is selling a 'pure white hell' jigsaw.
Jigsaw
The puzzle consists of 1,000 pieces - and is made even harder by virtue of the fact that all of the pieces are blank.
A description reads: ''A jigsaw puzzle is a tiling puzzle that requires the assembly of often oddly shaped interlocking and tessellating pieces.''
Reviews for the jigsaw suggest that it's the ideal gift for an enemy.
One review said: ''If you hate someone, or simply enjoy making them suffer, give them this puzzle. My parents have almost gone insane trying to complete this.''
Another added: ''I can't wait to see my brother's face when he opens this. He loves puzzles and challenges, and this is bound to finally stump him!
''Gets him back for being annoying for the last 17 years.''