Each of the coloured metal pieces are identical in size and shape. There is only one way to fit them all into the 12cm square wood tray. Designed by Jean Claude Constantin. Solution is included.

It may take an infinite amount of time to solve this mind-boggling metal brainteaser by designer Doug Engel. Try to take the four nickel-plated pieces apart then fit them back together. 7cm in diameter. Solution included.

Can you slide the four wood "L" shaped pieces around the tray so that the block is inside the corners? Designed by Serhiy and Peter Grabarchuk. 14cm x 10cm x 3cm. Solution included.

This stylish wooden box looks easy enough to open, but lift the brass hinge and you will find it's much more tricky than you think to access the chamber within. A clever brainteaser, perfect for hiding your small treasures. Made of walnut measuring 13cm long x 8cm wide x 5cm tall. Solution included.

Can you remove the ball from the stand of this challenging puzzle? The fixed nut on the double-ended bolt holds the ball, and the two brass pillars protruding from the base make this seem to be an impossible task, but never fear—there is a way. By Jean Claude Constantin. 10cm x 6cm x 7cm. Made of wood, brass and steel. Solution included.

A puzzle challenge by Jean Claude Constantin that's sure to keep you charged. Try to remove this authentic spark plug from the wooden box. 10cm x 6cm x 3cm. By Jean Claude Constantin. Solution included.

This wooden and brass hinged box may look simple enough, but try to open it. That's the catch. Designed by Doug Engel, this teaser of a puzzle is elegant enough to display in any room in your house. The perfect place for hiding important treasures. Made of maple and walnut. This item measures 8cm x 6cm x 4cm. Solution included.