Word Ladder
Start word, target word. Change one letter at a time. Each step must be a real English word. Get from start to target in as few steps as possible. Lewis Carroll invented this in 1879.
What it is
Word Ladder is a puzzle invented in 1879 by Lewis Carroll (yes, that one) and originally published in his column in Vanity Fair magazine. You're given two four-letter words. Your job: transform the first word into the second, one letter at a time, with every intermediate also being a real word. Classic example: CAT to DOG goes CAT → COT → DOT → DOG, in three steps.
How to play
- The start word is shown. The target is shown.
- Type the next word in the input. It must differ from the last word by exactly one letter, in the same position, and must be a real word in our dictionary.
- Hit Step (or press Enter). If valid, the word is added to your chain.
- Reach the target. The chain ends when you type the target word.
- Optimal is shown after you solve. We compute it via breadth-first search over the dictionary.
The trick
Most puzzles between common four-letter words take 4 to 8 steps optimally. New players over-shoot, taking 10-15 steps because they wander. The trick is to look at which letter positions need to change and plan a route. If "BIRD" needs to become "WORK", positions 1, 2, and 4 all need to change; position 3 (R) stays. So you can lock in any chain that keeps an R in position 3 the whole way: BIRD → BARD → BARK → WARK? (not a word). The dictionary constraint is what makes it interesting; sometimes a "shortcut" route is actually 6 steps because of dictionary gaps.
What this scored well on
- Pedigree. The puzzle has a 145-year history and remains undefeated as a "small word puzzle" format. We didn't have to design it, just produce it well.
- The optimal counter. Showing the optimum after you solve creates a "I should be able to do better" pull that drives replay. We didn't show it during the puzzle because that would change the game from exploration to executing a known route.
- Honest dictionary. Our dictionary is about 800 common 4-letter English words. Every puzzle is generated from pairs that are reachable; nothing is unsolvable.
What it gets wrong
Word Ladder, like Word Streak (#07), is unkind to non-native English readers. The optimal route often relies on words a player only fluent in everyday English might not know — "PORE", "LIRE", "FANE" and similar low-frequency words appear in some shortest paths. We restricted the dictionary to commonly recognised words, which makes some puzzles harder than they would be with a bigger dictionary, but kept the gameplay honest. We don't accept obscure words as valid moves.
Who it's for
Word Ladder is for readers of The New York Times Spelling Bee, fans of crossword puzzles, and anyone who reads more than they watch. It's a small daily ritual in the most literal sense — invented in a daily newspaper, suited to a single coffee.
Where we'd point you next
If you liked the word-based gameplay, try Word Streak (#07). If you liked the "shortest-path" feel, watch for graph-flavoured games in future issues — they're a strong design direction we'd like to explore further.
Released · 12 May 2026 · Editor's score 3.9 / 5 · Reviewed by Bill