Unlock the padlock code Activity book for adults: Puzzle mathematics and logic puzzles for adults | Look for the correct numbers to open the padlocks ... riddles book and smart math games for adults - Softcover

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Puzzle activity book of unlock the padlock code for adults , and a very good activity book for adults to develop the spirit of reasoning and analysis , for example : - The 1st digit is the multiplication of the 2nd digit ...........- The 4th digit of the padlock is equal to the 1st digit and the sum of the 4th digit and the 2nd digit is 12 by 3 and also is less than 12 .......... this book is a very good gift for family and friends.

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