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Where can I find a book of number crosswords? Or free number crosswords online?

I am looking for a book of "number crosswords." They are crosswords that use numbers instead of letters. Examples of clues would "this is a square", "this is a perfect square", "four consecutive digits descending (or ascending)", "this is a multiple of 5"etc. I am not sure what they are called sometimes they are called computations or number crosswords.

Public Comments

1. Do you mean "Crossnumber Puzzles"? here you go