Lewis Carroll’s favourite word game
Word ladders were popularised by Lewis Carroll, who called them doublets: turn HEAD into TAIL by changing one letter at a time, with every step a real word. They are deceptively tricky, a lovely mix of spelling, vocabulary and logic. A good ladder has a few obvious first moves and one clever step in the middle.
Type pairs of words with the same number of letters (like `cold warm`), one pair per line. The generator searches its everyday-word list for the shortest ladder between them and prints the right number of rungs. If no ladder exists using common words, it tells you rather than inventing one.
Every rung is a real word
Ladders are found with a breadth-first search over about 6,000 common English words, so the answer key only ever uses real, everyday words, and it is one of the shortest possible. Students may find a different valid ladder of the same length; that counts too. Turn on the middle-rung hint to give a stepping stone for younger solvers.
Ideas
- Use 3-letter ladders (CAT → DOG) for younger students, and 5-letter ladders for a real challenge.
- Up to six ladders fit on a page, which is great for a weekly puzzle sheet.
- Press “4 random ladders” for an instant worksheet.
Questions people ask
How do you solve a word ladder?
Change exactly one letter at each step to make a new real word, until you reach the end word. You can’t add, remove or rearrange letters.
Why did it say no ladder was found?
No chain of everyday words links those two words. Try different words, or a common pair like cold → warm.
Is the answer key the only solution?
It’s one of the shortest solutions. Students may find other valid ladders of the same length.
How long can the words be?
Any length in our list, but 3–5 letters works best. Longer words rarely have ladders using everyday words.
Can I give hints?
Yes. Turn on the middle-rung hint to fill in one word halfway down each ladder.