A word ladder puzzle has a source word and a target word, and to solve the puzzle you must find a chain of words to link the two.

A word ladder puzzle has a source word and a target word, and to solve the puzzle you must find a chain of words to link the two, in which two successive words always differ by a single letter, which in math-speak means they have a Hamming distance of $1$.

Some variations of word ladders allow letters to be removed or added as well (Levenshtein distance), and/or transpositions (Damerau-Levenshtein distance).

Example:

| COLD 
| CORD
| CARD
| WARD
V WARM
forms a word ladder from COLD to WARM.

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