V0.337 · CRYPTOGRAM

Cryptogram

Crack the message, one mapping at a time.

Pick a cipher letter, test a plaintext letter, and every matching symbol updates at once. Play an exact Daily or unlimited Practice; deeper analysis stays optional below.

Clean PB—

Practice Daily Cryptogram

Difficulty Unlimited seeded practice · progress autosaves locally

RunCleanDifficultyStandardTopic—Mapped0/0Edits0Time0:00

SELECTEDChoose a cipher letter

Choose a cipher symbol, then type or tap the plaintext letter you want to test.

Keyboard: A–Z assign · Backspace clear · ←/→ move unresolved · Ctrl/Cmd+Z undo · Shift+Ctrl/Cmd+Z redo.

Strategy & exact review · optionalPattern Coach, frequency, Daily archive, local history and the 180-position Solve Lab

CLEAN-SAFE · ANSWER-INDEPENDENT

Explainable Pattern Coach

Ranks unresolved symbols using only ciphertext evidence: occurrence count, one/two/three-letter words, repeated-letter shapes, distinct word coverage and unresolved neighbors. It never reads the hidden plaintext mapping to choose the recommendation.

FREQUENCY WORKBENCH

See where the cipher concentrates information

Frequency is evidence, not an answer key. English letter frequency varies by sentence, so the bars show the current cipher only and never claim that the top symbol must be E.

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unresolved symbols

Selected-symbol Pattern Lens

Select a cipher symbol to inspect its word shapes.

DAILY ARCHIVE

Replay this month

Daily selection is deterministic. Local completion history stays on this device.

SunMonTueWedThuFriSat

RECENT LOCAL SESSIONS

Your own solving history

No global percentile is fabricated. These are only this browser's sessions.

180-POSITION STRUCTURAL SOLVE LAB

Practice what to investigate next

Each task starts from a real frozen-bank cipher after replaying deterministic correct-mapping provenance. The answer asks which unresolved cipher symbol the same transparent structural heuristic ranks highest—not which plaintext letter it secretly is.

1 / 180
Easy

Choose the symbol with the strongest visible structural leverage.

ONE-TO-ONEMappings cannot collide silently

Every cipher symbol maps consistently to one plaintext letter, and one plaintext letter cannot be held by two symbols. The interface reports reassignments instead of hiding them.

CLEAN-SAFE COACHStructure is not the solution

Frequency, pattern shapes and structural ranking remain Clean because they use ciphertext only. Answer-level Check, Hint or Reveal marks the run Assisted.

956-ITEM FROZEN CORPUSKnowledge facts and questions—not an editorial quote network

The bank has 634 Easy, 205 Standard, 83 Hard and 34 Expert items across seven topics. It is local and finite; we do not claim the editorial scale or community network of dedicated cryptogram services.

DAILY + PRACTICEDeterministic without a backend

The same UTC date selects the same bank item and cipher key. Practice uses shareable seeds for repeatable sessions.

LOCAL RECORDSNo fake leaderboard

Clean PB, history and streak live in this browser. There is no account sync, public ranking or population percentile.

LEARNING PAYOFFDecode, then read the underlying fact

Question items reveal their stored answer and explanation only after solve or explicit Reveal.