The Zebra Puzzle: Full Clues, a Way In, and the Answer

The Zebra Puzzle is a five-house logic riddle that has fooled and delighted solvers since 1962. This piece gives you the full clues, a way to start, and the answer, which I worked out by hand and checked against every clue. Try it first if you like. The answer sits under its own heading near the end.

Where the puzzle comes from

The best-known version ran in Life International on December 17, 1962. The March 25, 1963 issue of Life printed the solution and the names of several hundred successful solvers, according to Wikipedia's Zebra Puzzle article.

You will often see it called Einstein's Riddle. The same article says there is no evidence that Einstein or Lewis Carroll wrote it. Puzzles Wiki adds a detail: the Life version names cigarette brands, and one source notes that Kool did not exist until 1933, which rules out Carroll, who died in 1898. Stories that Einstein wrote it as a boy are legend, not documented fact.

The puzzle

Here is the classic wording as it is usually circulated. The Life original may differ slightly in phrasing, so treat this as the standard text. Per Puzzles Wiki, the original has 15 statements and two questions, and it never mentions water or zebras in the clues. Also, "right" means the solver's right, and no two people share a quality.

1. There are five houses.
2. The Englishman lives in the red house.
3. The Spaniard owns the dog.
4. Coffee is drunk in the green house.
5. The Ukrainian drinks tea.
6. The green house is immediately to the right of the ivory house.
7. The Old Gold smoker owns snails.
8. Kools are smoked in the yellow house.
9. Milk is drunk in the middle house.
10. The Norwegian lives in the first house.
11. The man who smokes Chesterfields lives next to the man with the fox.
12. Kools are smoked in the house next to the house where the horse is kept.
13. The Lucky Strike smoker drinks orange juice.
14. The Japanese smokes Parliaments.
15. The Norwegian lives next to the blue house.

Questions: Who drinks water? Who owns the zebra?

How to start solving

Draw a grid with five columns for the houses and five rows for color, nationality, pet, drink and cigarette brand. Traditional solvers use a series of connected grids to rule pairs in or out, such as whether the Englishman drinks tea. One guide from Free to Play Puzzles rates it Hard and suggests 45 to 90 minutes. That guide also claims only 2% of people can solve it, and it calls the claim debatable. I would not repeat it.

Begin with the direct clues. Put the Norwegian in house 1 and milk in house 3. Those are fixed. Now watch the position words. "Next to" means either side. "Immediately to the right of" means one specific neighbor, in one direction. Mixing these up is the classic way to wreck a grid.

A short walkthrough follows.

1. The Norwegian is in house 1, so the blue house must be house 2 (clue 15).
2. Green is immediately right of ivory, so the pair can only sit in houses 3-4 or 4-5. House 3 holds milk, and green drinks coffee, so green is not house 3. That puts ivory in 4 and green in 5.
3. The Englishman lives in red. House 1 cannot be red, since the Norwegian is there, so red is house 3 and the Englishman lives there.
4. Yellow is the only color left for house 1, so Kools go there. The horse is next door, in house 2.

From here the rest falls into place one clue at a time.

Answer

None of my sources give the solution. This one was derived by hand from the 15 clues above and checked against each of them.

• House 1: yellow, Norwegian, water, Kools, fox
• House 2: blue, Ukrainian, tea, Chesterfields, horse
• House 3: red, Englishman, milk, Old Gold, snails
• House 4: ivory, Spaniard, orange juice, Lucky Strike, dog
• House 5: green, Japanese, coffee, Parliaments, zebra

So the Norwegian drinks water and the Japanese owns the zebra. Note how the last two answers appear. Water and the zebra are never named in the clues. You place every other attribute first, and the leftovers answer the questions.

Choosing a version and what the sources leave out

Not every zebra puzzle matches the original. Daily-style sites such as Puzzleship scale from four subjects with four attributes up to seven attributes, and vary the scenario while keeping the same method. Pick a version that states its questions and rules clearly, as the original does. Check whether it uses the original statements or a changed scenario, and whether it gives rules on left and right and on shared attributes.

The puzzle also serves as a benchmark for constraint satisfaction algorithms and for testing logical reasoning in large language models. Rosetta Code uses it as a task where programmers write code to solve it.

The sources have gaps. They do not say how the difficulty is measured beyond level structure, and they do not explain how the puzzle fits daily brain-training formats. They offer no solving records or timing rules either. If you want a time to beat, set your own. Start with the grid, use the direct clues first, and take your time.