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.


  • 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 6x6 puzzles

  • C + E = A + F
  • A + C = B + D
  • D ≠ 6
  • B ≠ 1
  • D ≠ 1
  • A + E = B + F


  • 2C = B + E
  • B > F
  • 2A = B + D
  • E > A


  • 2E = B + F
  • 2F = C + E
  • 2C = A + E
  • F > A


More games


Choose nine unique number using one simple rule.


Play the classic japanese logic game.

Greek Logic
Greek Logic

Fill the grid using the Greek letters.

Self-Referential Quiz
Self-Referential Quiz

Quizzes where you only need logic to solve them.