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Cross Number Puzzles
by Giulio Zambon

ISBN: 978-1-4826-1679-8
Publisher: MatheMagics Asia
Published in: 2013. Pages: 238.
Available in print from the publisher and from Amazon.

Fifty 6x6 puzzles suitable for all solvers, fifty 8x8s for more experienced solvers, and fifty 10x10s for those who like to be challenged.

Cross Number is like any normal crossword puzzle. You must solve the clues to be able to write the answers in the grid, like in the example below.