Ralf Rehberg » Sudoku and Maths for Children (Multiplication for children aged 9+) « 9+, June 2007 120 pages, 15.0 x 18.0 cm ISBN 978-3-7855-6083-9 pad 4,95 € (D)

Calculating, guessing, puzzling
Sumix is a new form of number puzzle. In the style of the enormously popular Sudoku, numbers between 1 and 9 are combined in a quadrat so that they add up or multiply to a given result. As in the Sudoku riddles, every number can be put down only once - the correct solution must be tried out. For all the little fans of Sudoku who have fun guessing and calculating!