Simultaneous equations
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problemNot a Polite Question
When asked how old she was, the teacher replied: My age in years is not prime but odd and when reversed and added to my age you have a perfect square...
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problemQuadruple Clue Sudoku
Four numbers on an intersection that need to be placed in the surrounding cells. That is all you need to know to solve this sudoku.
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problemAnother Quadruple Clue Sudoku
This is a variation of sudoku which contains a set of special clue-numbers. Each set of 4 small digits stands for the numbers in the four cells of the grid adjacent to this set.
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problemSimultaneous Equations Sudoku
Solve the equations to identify the clue numbers in this Sudoku problem.
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problemAll-Variables Sudoku
The challenge is to find the values of the variables if you are to solve this Sudoku.
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problemLCM Sudoku II
You are given the Lowest Common Multiples of sets of digits. Find the digits and then solve the Sudoku.