Meiji Seika is to Japan what Cadbury is to countries like the UK and Australia (though some will argue Meiji makes better chocolate). Which is probably why Hanayama Toys decided to choose Meiji chocolate bars when they designed their chocolate polyomino puzzles. The puzzles look just like large bars of Meiji milk or dark chocolate, down to the packaging, and are perfect as calorie-free gifts for chocolate lovers. The challenge of the puzzle is to put pieces together to form different shapes, after which you'll have to fit everything back into the rectangular box. That is, if you don't decide to give up and wander off in search of some real chocolate.

The milk chocolate version has 12 pieces, each a pentomino (5 "chocolate" squares), while the dark chocolate version has 11 pieces, each a hexomino (6 squares). They aren't available for retail online, it seems, but you may be able to find it at your nearest Japanese bookshop - I found mine at Kinokuniya.