Price: £12.99

How's your lateral thinking? Your spatial awareness? Your stress level? Take a deep breath then.

The 14 ingeniously shaped pieces form a cube inside the clear box, and once removed, they just have to be fitted back. In fact there are 19,186 different solutions. So shouldn’t be too difficult, right? Wrong! In fact it is very difficult indeed.

Empty the pieces out, then try and fit them all back into the box. Then take a break for lunch and try again later.

Despite the fact that there are lots of different ways to solve this puzzle it is still a real challenge, one of those obsessive problems that'll have you dreaming solutions and leaping out of bed to try them out.