Just when you thought the world had reached its Sudoku saturation point, Techno Source comes along with not just any Sudoku but CIRCULAR Sudoku. Forget the 9×9 grid, now we’re going round and round trying to find where numbers fit in the grid. Ours is not to question why but to gauge the level of appeal to parents and kids, and based on our testers comments, there is in fact room for more Sudoku. Especially when it comes with all the bells and whistles that TS added in. The backlit display and easy touch screen controls make this a perfect travel companion, one which parents said both they and their children would happily pack this summer.