Finding one puzzle answer does not prove there is only one

After a successful arrangement, deliberately alter an unresolved choice and test the constraints again. A second valid solution reveals ambiguity in the clue set, which matters if the author intended a unique answer.

Check each alternative against every condition. A second valid arrangement reveals that the clue set needs revision if uniqueness was intended.

Look for an alternative on purpose

Find one solution. Change an unresolved choice. Test all constraints.

Two different arrangements satisfying every clue show ambiguity.

Finding one answer does not prove uniqueness. Can another arrangement work?

Use a reduced card set.

Resources

• Puzzle Partner Challenge — Use the four-by-four puzzle to discuss deductions from the stated constraints.

Further reading

• Australian Curriculum Version 9 — Critical and Creative Thinking

Read next

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• A cooperative puzzle needs a reason to share information
• Crossword crossings are evidence for checking an answer

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