The world's most famous logic puzzle, reimagined for the web. Use deductive reasoning to determine which color, nationality, drink, and pet belong to each house.
3 houses, 3 attributes. Perfect for first-timers.
4 houses, 4 attributes. Sharpen your deduction.
5 houses, 5 attributes. The original Einstein challenge.
Each clue gives a logical fact about which values go together. There is exactly one arrangement that satisfies all clues.
Click a cell in the grid to cycle through: empty → ✓ (yes) → ✗ (no) → empty. The grid has houses as columns and attributes as rows.
Mark every cell you can deduce. When you're confident, click Check Answer. If you make a mistake, the wrong cells flash red.
You have 3 hints per puzzle. Each hint auto-fills one correct cell. Fewer hints = more stars!
Take a break. Your progress is auto-saved.