English cryptogram puzzle
Decoder
Work out the letter replacements to reveal a hidden English sentence. Use familiar word shapes and repeated letters to turn each small discovery into another clue.
One swap unlocks several clues
Every scrambled letter stands for one answer letter. Enter a guess once and it appears everywhere that code is used. Spaces and punctuation stay in place, so you can look for words as you work.
The collection contains 24 original short passages and six original riddles. Completing a riddle reveals its wording; you can then choose to reveal its separate answer.
Choose how much help you want
Beginner mode reveals three letter pairs and checks new guesses. Classic mode leaves you to test your own deductions. Practice mode shows the full key so you can learn the controls.
Play without a timer or score penalties. Undo a guess, erase a letter, or reveal one letter when stuck. Your current message and completed messages save in this browser when local storage is available.
Getting started
How to play Decoder
Look for a word
Use short words, repeated letters and the revealed clues to form a guess.
Choose a code letter
Tap a tile, then type or tap the English letter you think belongs above it.
Follow the new clues
Your guess fills every matching code. Keep going until the whole message is correct; open How to play for a worked example.
Ready when you are
Start a game of Decoder.
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