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Word ladder strategy
The graph underneath the puzzle, and the shapes that make a ladder short.
The graph underneath the puzzle
Every accepted word is a point, and two points are joined when the words differ by exactly one letter. A ladder is a walk through that graph, which is why every intermediate has to be a real word: an edge exists only when both ends do. Par is the number of steps on the shortest walk, and it is found by exhaustive search rather than estimated, so it belongs to the graph and not to opinion. Density decides how short your route can be. Four-letter word graphs are denser than five-letter ones, because fewer positions mean more words sit one letter apart. Denser graphs give shorter routes, which is why four-letter ladders are usually easier and shorter.
Change a vowel on the opening rung
Your opening rung sets the frame for everything after it. A step changes exactly one letter, so a move that changes a vowel keeps the consonants and leaves you inside the family of words built on that frame. That family is often where the rest of the route lives. A consonant move takes you into a different family, and the words you leave behind may have no other way back. None of this is a rule, because par comes from search rather than from a principle you can rely on. But when you have no route in mind, moving a vowel is the cheapest way to buy information. A word with a fresh vowel in a common slot usually has more live neighbours than the word you were standing on.
Vowel hubs and dead ends
A hub is a word with several one-letter neighbours that are all still playable. Hubs help for a plain reason: they give you choices, and choices are what you spend while the route is unclear. Vowel positions are a good place to look. A four-letter word whose vowels sit in ordinary slots can often be shifted to another vowel and remain a real word, and each shift is a valid rung. Prefer a word with more exits than the one you are standing on. A rung that improves your options is rarely wasted, even when it does not look like progress.
A dead end is a word with no usable neighbour: every word one letter away has already been played, is not accepted, or leads only backwards. These are cheap to avoid if you check before you commit. Count the words one letter away that you could still play. Two or three live neighbours is safe, one is a commitment, and none is a trap however close the word looks to the goal. Words built on letters that appear in few four-letter words tend to strand you, because there is little left to change them into. Rung a Day accepts about 2,300 common four-letter words, and a neighbour you are sure must exist may not be on that list.
A routine for the daily puzzle
Read the start and goal words side by side and count the positions where they differ. That count is a floor for par, never the answer, because a real route rarely changes each differing position outright. Then work from both ends: a word one step from the goal is a target you can aim at, and a hub near the middle is where the two halves can meet. Hints follow the same logic. Up to three hints are available per puzzle, and a hint reveals one letter of a shortest route, so it tells you what the route does, not what your current word should be.
- Count the positions that differ before you type.
- Move a vowel on the opening rung.
- Check how many neighbours a word still has.
- Work back from the goal as well as forward.
Questions
Why are four-letter ladders shorter than five-letter ones?
Four-letter word graphs are denser than five-letter ones. With fewer positions to vary, more words sit one letter apart, so there are more routes to choose from and the shortest route is usually shorter. That is why four-letter ladders are usually easier.
What makes a word a vowel hub?
It has several one-letter neighbours that are still playable, and its vowel slots can often be shifted while the consonants stay put. Each shift that lands on a real word is another rung you could take.
Should I change a vowel straight away?
No. It is a default rather than a rule. Changing a vowel is cheap and often keeps a few options alive, but follow whichever move leaves you with more playable neighbours. If a consonant change opens two routes and a vowel change opens none, take the consonant.
How do hints help with strategy?
A hint reveals one letter of a shortest route. That tells you something the route does, not necessarily what your next word is. Up to three hints are available per puzzle, so spend them where you are choosing between two plausible hubs rather than at the very start.
Play today’s ladder → one puzzle a day, about two minutes.