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WORDS · FREE TO PLAY

One-Letter Change

Find the word that differs in exactly one letter.

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How to play One-Letter Change

  1. Find the word that differs in exactly one letter.
  2. Read the prompt carefully and choose an answer, or type into the answer field.
  3. After checking, read the explanation. Use “Next round” to continue.
  4. Complete ten rounds for a score out of 100. Restart creates a fresh session.

A worked example

Change exactly ONE letter; keep the length. boat

the answer is coat. Compare the letters in the same positions.

A useful way to practice

These activities use English words and spelling. Language familiarity affects performance, so a score is not a general intelligence measure. Read the full instruction: spelling, meaning and letter order are different tasks.

What your result means

This is a recreational words activity. Results describe performance on this particular task, with this device and these rules. They are not a clinical assessment, IQ score or promise of improvements in daily life. Your best result and recent sessions stay in this browser; no account is required.

Is One-Letter Change free?

Yes. You can play the full activity without a payment, download or account.

Can I use a keyboard?

Use Tab to focus buttons and Enter or Space to activate them. Answer fields accept normal typing. The maze also supports arrow keys. Timed tests will differ between touch, mouse and keyboard input.

Why did my result change?

Practice, a different generated puzzle, distractions and input timing all affect results. Compare several sessions rather than drawing a conclusion from one attempt.

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