ThePuzzleLabs

Futoshiki

Einstein

Share

Play Einstein Futoshiki — ThePuzzleLabs

Try this Einstein Futoshiki puzzle on ThePuzzleLabs.

00:00
Classic
<
>
>
∨
<
∨
∧
<
>
∨
∧
∧
∧
<

How to Play Futoshiki

Rules

  • Fill every cell with a digit from 1 to 8.
  • Each row and column must contain each digit exactly once.
  • Inequality symbols (< > ∧ ∨) between cells must be satisfied.
  • ∧ means the top cell is less than the bottom cell; ∨ means greater.

Keyboard Shortcuts

  • 1-8 Place digit
  • Delete Erase cell
  • ↑↓←→ Navigate
  • N Toggle notes
  • U Undo
  • H Hint

Solve This Puzzle?

This will fill in the complete solution. The puzzle will be marked as “solved with reveal” rather than self-solved.

About einstein Futoshiki

Einstein Futoshiki is the hardest level: 8×8 and 9×9 grids with up to 81 cells. Every puzzle at this level is certified solvable through constraint propagation alone — no trial-and-error or backtracking needed.

That certification means every step forward can be deduced from the current state using naked singles, hidden singles, inequality forcing, and chain propagation. If you find yourself guessing, step back and look for a constraint you missed. The solution path exists, and it's purely logical.