Days of fun with challenging brainteasers
Put different colours and numbers on each row and column
Only use one Red 1, Red 2 and so on
Puzzle sizes of 3, 4, 5 and 7
Puzzles on Easy, Medium, Hard and Expert difficulty levels
40 puzzles to play in FREE app; 280 levels in PAID version
Based on Greco-Latin squares invented by the famous mathematician Leonard Euler
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