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Digit Sum

What is the sum of all the digits in all the integers from one to one million?

Eight Dominoes

Using the 8 dominoes make a square where each of the columns and rows adds up to 8

Two and Two

How many solutions can you find to this sum? Each of the different letters stands for a different number.

Constellation Sudoku

Age 14 to 18 Challenge Level:
Solution of Constellation Sudoku