How to play

  • The variables are numbers from 1 to the total number of variables, and each one is different;
  • When you see the letters together, like "AB," it means you multiply the variables, like A times B or A * B;
  • By looking at the clues (equations and inequalities), you create connections between the variables and their values using the grid:
    • Click once on a square to show that the value is false;
    • Click twice to assign the chosen value to the variable;
    • Click three times to clear the square.
  • The color of a clue changes when you assign values to all its variables:
    • GREEN means that the statement is true;
    • RED means that the statement is false.
  • Click on a clue to mark it as used;
  • The game ends when you correctly assign values to all the variables.


  • A good starting point is to determine which variables can't have the lowest or highest values. For example, if you see A > B, it means A ≠ 1;
  • When you have the equation "D + E = 4," for example, you can make the following statements:
    • D = 1 and E = 3 OR D = 3 and E = 1;
    • We can't have D = 2 and E = 2 because the variables must be different;
    • Also, no other variable can be 1 or 3.
  • Another quick tip: If you see A = 2B, it means A is an even number;
  • Feel free to use pen and paper if needed. Some puzzles might require it.

Aha! Puzzles+