The Collection
Photo — Mohamed Benziane, UnsplashEvery logic puzzle here is machine-checked by a solver before it is published — one provable solution, no ambiguous clues. Classic imports from the public domain are labeled until they pass review. Browse, attempt, and reveal the proof.
Showing 50 of 606 puzzles
Knights and Knaves: Judy, Heidi, Niaj, Bob, and Grace
On an island, every inhabitant is either a knight, who always tells the truth, or a knave, who always lies. You meet Judy, Heidi, Niaj, Bob, and Grace. Judy says: "Heidi is a knave." Heidi says: "Grace is a knight." Bob…
The Five Desks: Tomás, Maya, Inés, Leo, and Finn
Five persons — Tomás, Maya, Inés, Leo, and Finn — each have exactly one mug, programming language, plant, and snack, and no two share any of them. Match each person to their mug, programming language, plant, and snack fr…
The Five Platforms: Priya, Zara, Keiko, Luca, and Jonas
Five platforms stand in a row, numbered 1 to 5 from left to right. Each holds exactly one of each attribute, and no attribute repeats. Work out the full arrangement from these clues: 1. The traveler reading a guidebook …
Knights and Knaves: Niaj, Peggy, Eve, Mallory, and Carol
On an island, every inhabitant is either a knight, who always tells the truth, or a knave, who always lies. You meet Niaj, Peggy, Eve, Mallory, and Carol. Niaj says: "Carol is a knight and Peggy is a knave." Peggy says:…
The Five Platforms: Mateo, Zara, Luca, Jonas, and Keiko
Five travelers — Mateo, Zara, Luca, Jonas, and Keiko — each have exactly one ticket class, luggage, destination, and reading material, and no two share any of them. Match each traveler to their ticket class, luggage, des…
The Five Desks: Noor, Finn, Maya, Leo, and Tomás
Five desks stand in a row, numbered 1 to 5 from left to right. Each holds exactly one of each attribute, and no attribute repeats. Work out the full arrangement from these clues: 1. The owner of the green mug is directl…
Knights and Knaves: Carol, Ivan, Dave, Olivia, and Sybil
On an island, every inhabitant is either a knight, who always tells the truth, or a knave, who always lies. You meet Carol, Ivan, Dave, Olivia, and Sybil. Ivan says: "Dave is a knave and Olivia is a knave." Dave says: "…
The Five Plots: Kwame, Rafael, Ibrahim, Lena, and Hana
Five gardeners — Kwame, Rafael, Ibrahim, Lena, and Hana — each have exactly one tool, watering day, crop, and fence, and no two share any of them. Match each gardener to their tool, watering day, crop, and fence from the…
The Five Seats: Farid, Bao, Chiara, Dmitri, and Esi
Five seats stand in a row, numbered 1 to 5 from left to right. Each holds exactly one of each attribute, and no attribute repeats. Work out the full arrangement from these clues: 1. The guest who brought curry is immedi…
Knights and Knaves: Ivan, Bob, Carol, Mallory, and Judy
On an island, every inhabitant is either a knight, who always tells the truth, or a knave, who always lies. You meet Ivan, Bob, Carol, Mallory, and Judy. Ivan says: "Judy is a knave." Bob says: "Carol is a knave." Carol…
The Five Seats: Dmitri, Chiara, Bao, Esi, and Amara
Five guests — Dmitri, Chiara, Bao, Esi, and Amara — each have exactly one wine, dish, gift, and hometown, and no two share any of them. Match each guest to their wine, dish, gift, and hometown from these clues: 1. The M…
The Five Plots: Hana, June, Kwame, Ibrahim, and Rafael
Five plots stand in a row, numbered 1 to 5 from left to right. Each holds exactly one of each attribute, and no attribute repeats. Work out the full arrangement from these clues: 1. Kwame is immediately to the right of …
Knights and Knaves: Ivan, Alice, Eve, Frank, and Bob
On an island, every inhabitant is either a knight, who always tells the truth, or a knave, who always lies. You meet Ivan, Alice, Eve, Frank, and Bob. Ivan says: "Frank and I are of different types." Eve says: "Frank is…
The Five Platforms: Mateo, Zara, Jonas, Keiko, and Luca
Five travelers — Mateo, Zara, Jonas, Keiko, and Luca — each have exactly one ticket class, reading material, luggage, and destination, and no two share any of them. Match each traveler to their ticket class, reading mate…
The Five Houses: The Brit, the Dog Owner, and the Gardener
Five houses stand in a row, numbered 1 to 5 from left to right. Each holds exactly one of each attribute, and no attribute repeats. Work out the full arrangement from these clues: 1. The rabbit owner is immediately to t…
Knights and Knaves: Ivan, Sybil, Olivia, Carol, and Rupert
On an island, every inhabitant is either a knight, who always tells the truth, or a knave, who always lies. You meet Ivan, Sybil, Olivia, Carol, and Rupert. Ivan says: "I am a knave or Olivia is a knight." Olivia says: …
The Five Seats: Amara, Farid, Chiara, Dmitri, and Bao
Five guests — Amara, Farid, Chiara, Dmitri, and Bao — each have exactly one hometown, dish, wine, and gift, and no two share any of them. Match each guest to their hometown, dish, wine, and gift from these clues: 1. Chi…
The Five Houses: The Baker, the Brit, and the Person in the Green House
Five houses stand in a row, numbered 1 to 5 from left to right. Each holds exactly one of each attribute, and no attribute repeats. Work out the full arrangement from these clues: 1. The person in the green house is dir…
Knights and Knaves: Heidi, Sybil, Eve, Niaj, and Peggy
On an island, every inhabitant is either a knight, who always tells the truth, or a knave, who always lies. You meet Heidi, Sybil, Eve, Niaj, and Peggy. Heidi says: "Peggy and Eve are of different types." Sybil says: "H…
The Five Desks: Maya, Leo, Tomás, Inés, and Finn
Five persons — Maya, Leo, Tomás, Inés, and Finn — each have exactly one plant, mug, snack, and programming language, and no two share any of them. Match each person to their plant, mug, snack, and programming language fr…
The Five Desks: Finn, Tomás, Inés, Noor, and Leo
Five desks stand in a row, numbered 1 to 5 from left to right. Each holds exactly one of each attribute, and no attribute repeats. Work out the full arrangement from these clues: 1. The owner of the red mug is immediate…
Knights and Knaves: Judy, Niaj, Carol, Grace, and Dave
On an island, every inhabitant is either a knight, who always tells the truth, or a knave, who always lies. You meet Judy, Niaj, Carol, Grace, and Dave. Judy says: "Grace is a knave or Carol is a knave." Niaj says: "Jud…
The Five Seats: Chiara, Esi, Bao, Farid, and Dmitri
Five guests — Chiara, Esi, Bao, Farid, and Dmitri — each have exactly one wine, hometown, dish, and gift, and no two share any of them. Match each guest to their wine, hometown, dish, and gift from these clues: 1. Dmitr…
The Five Desks: Maya, Noor, Inés, Finn, and Tomás
Five desks stand in a row, numbered 1 to 5 from left to right. Each holds exactly one of each attribute, and no attribute repeats. Work out the full arrangement from these clues: 1. The orchid keeper is immediately to t…
Knights and Knaves: Niaj, Grace, Bob, Frank, and Peggy
On an island, every inhabitant is either a knight, who always tells the truth, or a knave, who always lies. You meet Niaj, Grace, Bob, Frank, and Peggy. Niaj says: "Frank and I are of different types." Grace says: "Pegg…
The Five Desks: Leo, Inés, Noor, Maya, and Tomás
Five persons — Leo, Inés, Noor, Maya, and Tomás — each have exactly one mug, plant, programming language, and snack, and no two share any of them. Match each person to their mug, plant, programming language, and snack fr…
The Five Desks: Leo, Maya, Noor, Inés, and Finn
Five desks stand in a row, numbered 1 to 5 from left to right. Each holds exactly one of each attribute, and no attribute repeats. Work out the full arrangement from these clues: 1. The Swift programmer is immediately t…
Knights and Knaves: Mallory, Grace, Sybil, Frank, and Olivia
On an island, every inhabitant is either a knight, who always tells the truth, or a knave, who always lies. You meet Mallory, Grace, Sybil, Frank, and Olivia. Mallory says: "Sybil is a knave." Grace says: "I am a knave …
The Five Shelves: Petrova, Vásquez, Tanaka, Moreau, and Okafor
Five authors — Petrova, Vásquez, Tanaka, Moreau, and Okafor — each have exactly one bookmark, binding, genre, and cover colour, and no two share any of them. Match each author to their bookmark, binding, genre, and cover…
The Five Shelves: Tanaka, Moreau, Petrova, Vásquez, and Lindqvist
Five shelves stand in a row, numbered 1 to 5 from left to right. Each holds exactly one of each attribute, and no attribute repeats. Work out the full arrangement from these clues: 1. The author whose book holds a press…
Knights and Knaves: Dave, Eve, Judy, Ivan, and Carol
On an island, every inhabitant is either a knight, who always tells the truth, or a knave, who always lies. You meet Dave, Eve, Judy, Ivan, and Carol. Dave says: "Ivan is a knave and Eve is a knave." Eve says: "If Dave …
The Five Shelves: Tanaka, Okafor, Moreau, Vásquez, and Petrova
Five authors — Tanaka, Okafor, Moreau, Vásquez, and Petrova — each have exactly one cover colour, genre, binding, and bookmark, and no two share any of them. Match each author to their cover colour, genre, binding, and b…
The Five Houses: The Cat Owner, the German, and the Coffee Drinker
Five houses stand in a row, numbered 1 to 5 from left to right. Each holds exactly one of each attribute, and no attribute repeats. Work out the full arrangement from these clues: 1. The tea drinker is immediately to th…
Knights and Knaves: Judy, Eve, Alice, Frank, and Carol
On an island, every inhabitant is either a knight, who always tells the truth, or a knave, who always lies. You meet Judy, Eve, Alice, Frank, and Carol. Judy says: "Frank is a knight." Eve says: "Carol is a knave and I …
The Five Seats: Chiara, Bao, Amara, Farid, and Dmitri
Five guests — Chiara, Bao, Amara, Farid, and Dmitri — each have exactly one gift, wine, hometown, and dish, and no two share any of them. Match each guest to their gift, wine, hometown, and dish from these clues: 1. Bao…
The Five Platforms: Jonas, Mateo, Keiko, Luca, and Priya
Five platforms stand in a row, numbered 1 to 5 from left to right. Each holds exactly one of each attribute, and no attribute repeats. Work out the full arrangement from these clues: 1. The traveler with the duffel bag …
Knights and Knaves: Peggy, Grace, Judy, Frank, and Eve
On an island, every inhabitant is either a knight, who always tells the truth, or a knave, who always lies. You meet Peggy, Grace, Judy, Frank, and Eve. Peggy says: "Judy is a knave." Grace says: "Frank is a knave or Ju…
The Five Seats: Amara, Esi, Chiara, Bao, and Dmitri
Five guests — Amara, Esi, Chiara, Bao, and Dmitri — each have exactly one hometown, wine, dish, and gift, and no two share any of them. Match each guest to their hometown, wine, dish, and gift from these clues: 1. The g…
The Five Desks: Leo, Tomás, Noor, Finn, and Maya
Five desks stand in a row, numbered 1 to 5 from left to right. Each holds exactly one of each attribute, and no attribute repeats. Work out the full arrangement from these clues: 1. Maya is immediately to the right of t…
Knights and Knaves: Carol, Ivan, Mallory, Frank, and Niaj
On an island, every inhabitant is either a knight, who always tells the truth, or a knave, who always lies. You meet Carol, Ivan, Mallory, Frank, and Niaj. Carol says: "Frank is a knight and Mallory is a knight." Mallor…
The Five Seats: Bao, Farid, Chiara, Esi, and Dmitri
Five guests — Bao, Farid, Chiara, Esi, and Dmitri — each have exactly one wine, gift, dish, and hometown, and no two share any of them. Match each guest to their wine, gift, dish, and hometown from these clues: 1. The g…
The Five Plots: Ibrahim, Kwame, Rafael, June, and Hana
Five plots stand in a row, numbered 1 to 5 from left to right. Each holds exactly one of each attribute, and no attribute repeats. Work out the full arrangement from these clues: 1. The gardener who waters on Wednesday …
Knights and Knaves: Peggy, Frank, Bob, Heidi, and Alice
On an island, every inhabitant is either a knight, who always tells the truth, or a knave, who always lies. You meet Peggy, Frank, Bob, Heidi, and Alice. Peggy says: "Heidi is a knight." Frank says: "Alice is a knave or…
The Five Seats: Farid, Amara, Chiara, Dmitri, and Bao
Five guests — Farid, Amara, Chiara, Dmitri, and Bao — each have exactly one wine, gift, hometown, and dish, and no two share any of them. Match each guest to their wine, gift, hometown, and dish from these clues: 1. The…
The Five Shelves: Petrova, Lindqvist, Vásquez, Tanaka, and Moreau
Five shelves stand in a row, numbered 1 to 5 from left to right. Each holds exactly one of each attribute, and no attribute repeats. Work out the full arrangement from these clues: 1. The author with the spiral-bound ed…
Knights and Knaves: Olivia, Eve, Carol, Dave, and Bob
On an island, every inhabitant is either a knight, who always tells the truth, or a knave, who always lies. You meet Olivia, Eve, Carol, Dave, and Bob. Olivia says: "Eve is a knave." Eve says: "Olivia is a knave or Caro…
The Five Lanes: Dario, Aiko, Bruno, Gustav, and Elif
Five drivers — Dario, Aiko, Bruno, Gustav, and Elif — each have exactly one sponsor, fuel, car colour, and mascot, and no two share any of them. Match each driver to their sponsor, fuel, car colour, and mascot from these…
The Five Houses: The Coffee Drinker, the Cat Owner, and the Painter
Five houses stand in a row, numbered 1 to 5 from left to right. Each holds exactly one of each attribute, and no attribute repeats. Work out the full arrangement from these clues: 1. The beer drinker is immediately to t…
Knights and Knaves: Peggy, Ivan, Frank, Rupert, and Sybil
On an island, every inhabitant is either a knight, who always tells the truth, or a knave, who always lies. You meet Peggy, Ivan, Frank, Rupert, and Sybil. Peggy says: "Ivan and Frank are of the same type." Ivan says: "…
The Five Shelves: Vásquez, Lindqvist, Tanaka, Petrova, and Okafor
Five authors — Vásquez, Lindqvist, Tanaka, Petrova, and Okafor — each have exactly one cover colour, bookmark, genre, and binding, and no two share any of them. Match each author to their cover colour, bookmark, genre, a…
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