Transform one word into another, changing a single letter each step.
Turn the start word into the target, changing one letter at a time.
Word Ladder is a classic puzzle invented by Lewis Carroll. You are given a start word and a target word of the same length. The goal is to transform the start word into the target by changing one letter at a time.
To get from COLD to WARM: COLD → CORD → WORD → WARD → WARM. Each rung differs from the last by a single letter, and every rung is a real word. Every puzzle is generated to be solvable, so a path always exists.