Could you improve on a simple bar of chocolate? Yes, you can convert it into a vintage game - which is what you get with the Meiji Tetris-style chocolate game.
Straight out of Japan, it's a chocolate bar with a difference - choose your type (white, milk or plain - going up in order of difficulty), then break up the bar in Tetris-like pieces.
Scramble them up, then try and re-create the block with the Tetris chocolate. Apparently, it's not that easy - especially if you eat some. And if you can't do it in one sitting, a plastic box is on hand to store it. Available online and yours for the equivalent of £3.50.
Strapya World (via Popgadget)
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Er no, it's not Tetris it's Pentominoes!
The clue is the fact that pieces each consist of 5 blocks ;-)