A spot-the-difference puzzle needs intentional, checkable changes

Make the answer key while editing the second copy of an original drawing. That record distinguishes designed differences from printing artefacts and gives a new solver a fair basis for checking the result.

Choose clear changes. Mark the key. Test with a partner.

Document each change before testing

Removing a drawn window is a specific change; poor photocopy quality is not.

Keep the answer key tied to intentional changes. A partner should not need to infer whether a printing artefact counts as a difference.

Avoid relying only on subtle colour differences. Can every intended change be verified?

Use larger features.

Resources

• My Puzzle Strategy — Record a strategy and one specific observation about how it helped.

Further reading

• Australian Curriculum Version 9 — Critical and Creative Thinking

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