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Hard Logic Puzzles for Adults

Five people, five choices in each category and up to ten clues, most of them “not” and “either… or…”. Hard logic grids give you very few direct answers: you get there by cross-referencing the blocks until everything falls into place. Every puzzle still has exactly one solution and needs no guessing.

Free5 × 5 gridsFor adultsAnswers included

Pets and Hobbies

Hard · 8 clues

Five friends each own a different pet and enjoy a different hobby. Use the clues to find out who goes with what.

  1. Alice does not enjoy chess.
  2. Ben enjoys either fishing or gardening.
  3. David owns either the cat or the goldfish.
  4. The person who owns the parrot enjoys either knitting or gardening.
  5. Alice owns the rabbit.
  6. The person who owns the goldfish enjoys either gardening or chess.
  7. Clara owns either the cat or the rabbit.
  8. David enjoys either fishing or gardening.
PetHobby
CatDogParrotRabbitGoldfishKnittingFishingPaintingGardeningChess
NameAlice
Ben
Clara
David
Emma
HobbyKnitting
Fishing
Painting
Gardening
Chess

Swipe the grid sideways to see every column.

Tap a square once for ✗ (no), twice for ● (yes), three times to clear.

Download PDF

8 hard puzzles, one per page, with an answer key at the end.

Printable PDF

Preview of the hard logic puzzles PDFHard Logic Puzzles · 8 puzzlesOne per page · answers included

How to crack a hard logic grid

  1. Mark every X first. Go through all the “not” clues and all the options an “either… or…” clue rules out.
  2. Look for a row or column with four X marks. The fifth square is the dot; then cross out the rest of its column and row.
  3. Carry facts across blocks. If Helen waters on Monday and the Monday gardener does not grow roses, Helen does not grow roses either.
  4. Revisit the “either” clues. As soon as one of the two choices is crossed out, the other is the answer.
  5. Repeat. Each new dot usually unlocks the next one.

Logic puzzles for adults and seniors

Hard grids are a satisfying, quiet challenge for adults who enjoy sudoku or crosswords and want something that uses a different kind of reasoning. They also work well for seniors and puzzle clubs: no general knowledge or spelling is needed, only patience. The PDF prints one puzzle per page with a clear grid and the answer key at the back.

Questions

Are hard logic puzzles too difficult for beginners?

They can be. If you are new to logic grids, start with the easy or medium puzzles to learn the method, then come back.

Is guessing ever needed?

No. Each puzzle is checked by a solver that only uses the steps described on this page, so you can always find the next move by reasoning.

Other levels

Logic puzzles

Easy Logic Puzzles

3 × 3 grids · Ages 8 and up

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Medium Logic Grid Puzzles

4 × 4 grids · Teens and adults