Special offer: RRP £19.99, our Price £9.95 (while stocks last)

If Carol Vorderman is to be believed, Sudoku is sweeping the nation. If you fancy being part of this lunatic mathematical craze, then we have the perfect gadget for you. Our electronic Sudoku game delivers 1,000,000 Sudoku puzzles (that should keep you busy!) to your fingertips and offers three levels of difficulty, from beginner to intermediate, and for the Mensa candidates, expert.

The premise is simple. You start the game with a number of digits arranged within several boxes. The idea is to fill every column and row with the digits 1 to 9 but you're only allowed to use each digit once in a column or row. It sounds blissfully simple but believe us, it isn't.

You'll be scratching your head for hours over this, while simultaneously getting the sort of grey matter workout you won't have experienced since that ill-advised degree you did in pure and applied mathematics.