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 8x8 puzzles

  • D + 9 = A + G
  • C = BE
  • A ≠ 8
  • A = E + 2F + 1
  • B + G = A

Solve

  • C + 3 = B
  • D = DE
  • H > A
  • G ≤ 4
  • F = C + D
  • B + G > AE + 2C
  • 2C + EE = 1 if and only if F = 4C

Solve

  • B + C = 8
  • B + D + E = F
  • H = D + E
  • E + F = G
  • BC = C if and only if C + 3E + 1 = G

Solve