Codeword

Cracking a crossword with no clues

A Codeword is a crossword stripped of its clues. Every letter of the alphabet has been swapped for a number, the same number wherever that letter appears, and a couple of letters are filled in to get you started. There are no definitions to solve. You crack the grid the way you would crack a cipher, using the shapes of the words themselves. Type a letter into one cell and every cell holding that number updates at once, so a single good deduction ripples across the whole puzzle. That ripple is the engine of the game: you are never solving one word, you are solving all of them a little at a time.

Where to get a foothold

• Start from the given letters and look for short words: a two- or three-letter word built around a known letter narrows the options fast.
• Hunt for a lone single-letter word: in English it's almost always A or I.
• A number that keeps appearing at the end of words is often E, S, or part of a common ending like -ED and -ING.
• Spot a Q and the very next letter is nearly always U, one of the most reliable cracks in the whole grid.
• Track which letters you've used on the alphabet list so you can finish off the last few by elimination.

Two-letter words are little gifts as well. English keeps a short list of them in everyday use (of, to, in, it, is, at, on, so, do, up and their friends), so a two-cell word with one known letter often collapses to a single candidate. And remember that wherever an across word and a down word cross, that cell belongs to both. After every entry, read the crossing word too, because the confirmation, or the contradiction, usually shows up in the word you were not looking at.

Letter frequency is your friend

The numbers that appear most often are your best early guesses. E is the most common letter in English by a wide margin, trailed by T, A, O, I and N. Printers once arranged their type in roughly that order, which is where the old string ETAOIN comes from. So a number scattered all over the grid is probably one of those six, while the rarest letters (J, Q, X and Z) show up once or twice at most and are easy to pin late. This kind of counting is genuinely ancient: the scholar Al-Kindi described frequency analysis for breaking ciphers in ninth-century Baghdad, over a thousand years before these puzzles became a fixture of British newspaper pages. A Codeword is that same codebreaking, shrunk to teatime size.

A worked crack

Say the grid shows a three-letter word where the second and third cells carry the same number. English barely has any such words: ALL, ADD, EGG, OFF, INN, TOO, SEE, BEE and a few more. Now suppose the first cell's number is already known to be A. You are down to ALL or ADD. Look for that doubled number elsewhere in the grid: if it starts another word, L is far more likely than D, and a word shaped L-something settles it. Fill in L and watch a dozen cells light up at once. Doubles are generally kind to you, since LL, SS, EE and OO cover most doubled pairs in English, so a repeated number inside a word narrows to a handful of letters instantly. Endings help the same way: a three-number run closing several long words is very often I-N-G, and testing it costs nothing.

Finishing, and when a guess breaks

Track the alphabet list as you go. The endgame of a Codeword is pure elimination: with twenty letters placed, the last few numbers can only be the leftover letters, and rare ones like X or Z tend to slot into obvious homes. If a guess was wrong, the grid tells you fast, because some crossing word stops looking like English. Do not nurse it along. Swap the letter out, let every cell update, and read the crossings again. Three or four correct letters is usually the tipping point where the whole grid tumbles out in a chain, which is why the opening minutes are careful and the last ones are a sprint.