Free
In-App Purchases
Rating summary
About
Decode & Deduce is a cryptogram mystery game. Decode substitution-letter messages, read the evidence, and choose the conclusion that fits each case.
Start with the original 10 cases, which remain free.
Case Pack 1 contains 51 mysteries with 153 cryptogram puzzles. Unlock the pack with one purchase, including all hints, replays, and updates to these cases. There is no subscription. Future case packs are separate.
Already own Case Pack 1? The 30 newly added cases are included with your existing purchase.
The app uses English.
To restore an owned pack, open Settings and tap Restore Purchases. Restoring purchases unlocks owned cases; it does not recover local puzzle progress.
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What's New in Decode & Deduce
1.2.1
November 10, 2026
Case Pack 1 now includes 51 mysteries and 153 cryptogram puzzles, with 30 new cases added in this update. Already own the pack? All 30 additions are included with your existing purchase. The original 10 cases remain free. The app is in English.
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Subscriptions & In-App Purchases
$2.99
Case Pack 1
51 cases, 153 puzzles. Requires app v1.2.1+.







