Futoshiki
            
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Futoshiki also known as "More or Less" is a logic puzzle with simple rules and challenging solutions.
The rules are simple.
            You have to fill the grid with numbers so that: 
            - The numbers are from 1 to the size of the grid i.e. 1 to 5 for a 5x5 puzzle. 
            - Each row and column must contain only one instance of each number. 
            - The numbers should satisfy the comparison signs - less than or greater than. 
            - For bigger puzzles the letters (A,B,C etc.) follow after the number 9.
        
