Cipher
Rate itWork out which letter stands for which and reveal the day's hidden quote.
Every day: One new coded quote a day, the same for every player, with two letters given to start and a leaderboard for the day. New puzzle: Midnight UTC (00:00 UTC).

Cipher is a free daily cryptogram from Puzzle Theory. Each day a well-known quote is shown with every letter swapped for another, and you work out the substitution from word shapes and letter patterns. It needs no account, and a practice mode gives you more quotes between dailies.
About Cipher
Cipher is a quote cryptogram on Puzzle Theory, a site of daily word, number and logic puzzles. Every letter of a famous quote or proverb has been replaced by another letter, and the same swap holds across the whole line. Your job is to find out what each coded letter really stands for.
A new quote goes up at 00:00 UTC and is the same for every player. Two letters are filled in for you at the start. You type a guess under any coded letter and it fills in every place that letter appears, so one good guess can open up several words at once. Each real letter can only be used once, and giving it to a new coded letter takes it off the old one. The puzzle finishes by itself as soon as every guess matches the quote, and a timer and a letter count show how far along you are.
The daily quote and the unlimited practice mode are free and need no sign-up. Puzzle Theory Pro, a paid plan, adds a Hard mode with longer, less familiar quotes and opens the past puzzles. A leaderboard sits beside the daily puzzle.
Cipher suits players who like newspaper cryptograms and want one short quote a day in the browser, with letters rather than numbers as the code.
How to play Cipher
- Open Cipher on Puzzle Theory and stay on the Daily tab for the day's quote.
- Look at the coded line: two letters are already given to get you started.
- Pick a coded letter and type the real letter you think it stands for; it fills in everywhere that letter appears.
- Use short words, doubled letters and repeated words to test and change your guesses; each real letter can be used only once.
- Keep going until every letter matches the quote and the puzzle solves itself.
- Switch to Practice for more quotes, or come back after 00:00 UTC for the next daily.
Tips
- A coded letter standing alone as a word is almost always A or I.
- Three-letter words that repeat in a quote are often THE or AND.
- A doubled coded letter is most likely LL, SS, EE or OO.
- Fill in what the two given letters reveal first; they often finish a short word for you.
Questions
What time does Cipher reset?
A new quote appears every day at 00:00 UTC, the same for every player.
Is Cipher free?
Yes. The daily quote and the practice mode are free with no account. Puzzle Theory Pro, a paid plan, adds a Hard mode and the past puzzles.
Can two coded letters stand for the same real letter?
No. The code is one-to-one, so giving a real letter to a new coded letter removes it from the old one.
Ratings and reviews
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