• B + C = A
  • B + D = C

Solve

  • B = CC
  • AD = D

Solve

  • B + D = A + 2
  • A + D = B + 4

Solve

  • B + D = A + 4
  • B + C = D + 3

Solve

  • C = D + 2
  • A = D + 1
  • A = B + 2

Solve

  • A = D + 1
  • D = C + 2

Solve

  • B = 4D
  • A = 3D

Solve

  • 2C = B
  • 4D = 3B

Solve

  • 2C = B
  • A > B
  • 2A = 3B

Solve

  • 4A = 3B
  • 2B = 4D

Solve

  • B + D = A + C
  • D ≠ 2
  • A ≠ 4
  • C ≠ 4
  • A ≠ 3
  • B ≠ 4

Solve

  • C + D = A + B
  • D ≠ 2
  • A ≠ 2
  • C ≠ 2
  • D ≠ 4

Solve

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

Solve

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

Solve

  • A + C ≤ 3
  • C + D = B

Solve

  • B + D = C
  • B + C ≤ 5
  • C > A

Solve

  • A + C = 3
  • A + B = 6

Solve

  • A + C = 6
  • A + B + D = 8
  • A + B = 5

Solve

  • if A + D ≤ 6 then B < 1
  • if C ≤ 2 then A + B ≤ 4

Solve

  • if B ≤ 3 then C ≤ 2
  • if D ≠ 1 then A + B ≤ 4
  • if A + D ≤ 5 then B < 2

Solve

  • C + D ≤ 6 if and only if A > 1
  • D < 1 if and only if B ≤ 2
  • D ≠ 4 if and only if A ≤ 3
  • A + D ≤ 3 if and only if B ≠ 3

Solve

  • A + B ≤ 7 if and only if C + D ≤ 3
  • C < 3 if and only if A ≠ 3
  • A ≠ 2 if and only if D ≤ 1

Solve

  • A + B = 5
  • C = BC
  • B + C = 4

Solve

  • 2B + C = A

Solve

  • D = BB
  • AC = BC + C

Solve

  • B > AC
  • AA = B

Solve

  • BC = A + C + D
  • 2D < 4

Solve

  • 2C = B
  • B + D > 4C
  • 4C = D

Solve

More games

Sudoku
Sudoku

Play the classic japanese logic game.

IQ Tests
IQ Tests

Solve our exclusive IQ Tests and get your result for free.

Logic Grid Puzzles
Logic Grid Puzzles

Complete the grid by using logic and the given clues of each problem.

Zebra Puzzles
Zebra Puzzles

Use logic deductions to solve problems that are similar to the Einstein's Riddle.