How to play

  • The variables represents unique integers ranging from 1 to the number of variables;
  • Multiplication is implicit: AB means A times B, or A * B;
  • Based on the clues (equations and inequations), use the grid to create relations between variables and values:
    • Click once on a square to mark that value as false;
    • Click twice to assign the chosen value to the variable;
    • Click three times to clear the square.
  • The color of a clue changes after you assign values to all of 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 all values are correctly assigned to the variables.

Tips

  • Figuring out which variables can't have the lowest or the highest values is a good starting point, e.g, A > B shows that A ≠ 1;
  • Analyzing the hypothetical equation C + D = 4, we can make the following statements:
  • Another quick tip: A = 2B means that A is even;
  • Don't be afraid of using pen and paper. Some puzzles might require it.

More 9x9 puzzles

  • A + B = I
  • C + F = I
  • E + I = H
  • C + G = F
  • C + I = D
  • B + F = H

Solve

  • C + D = H + 8
  • A + B = G + 8
  • D + E = B + 8
  • H + I = D + 3
  • C + D = G + 9

Solve

  • C + H = A + 2
  • A + G = E + 5
  • A + D = E + 9
  • E + F = G + 3
  • E + I = F + 6
  • A + F = C + 1

Solve