SkyLoop
Brick Drops
Bus Matrix
Pause Line
First Mahjong
Recall Card
Habit Hero
First War
First Treasure
First Color
First PipeCryptogram puzzles for iPhone
Letter Vault
Crack the code, one letter at a time
Letter Vault is a cryptogram puzzle game for iPhone. Every phrase is encrypted so each letter becomes a number, and you work out the mapping one guess at a time. There are 1,321 curated phrases in English and Turkish across quotes, proverbs, sayings and movie titles, each playable at three difficulties. Solve to climb from Newcomer to Master, complete category collections and earn achievements. All progress stays on your device.
- Platform
- iOS 17.0+, iPhone
- Category
- Cryptogram Puzzle Game
- At a glance
- 1,321 phrasesEnglish & TurkishDaily Challenge5 game modes7 free themes
What’s in Letter Vault
Five ways to play: Classic, Time Attack (90 seconds), Daily Challenge with streaks, Practice and Endless
1,321 curated phrases in English and Turkish across quotes, proverbs, sayings and movie titles, each at Easy, Medium and Hard for 3,963 puzzle variants
A few letters are revealed at the start, a hint reveals one more, and watching a short ad earns two bonus hints
Rank up from Newcomer to Master, complete category collections and celebrate milestones as you solve
Ten achievements you can earn by playing, all tracked on your device
Seven visual themes, every one free, with a live preview before you switch
Wordle-style tiles, a 3D keyboard, confetti on a win and gentle classical music while you solve
Support
Questions, bug reports and feedback for Letter Vault go straight to the developer.
Email info@zyqion.comReplies usually within two days.
What the app includes
- Classic, Time Attack, Daily Challenge, Practice and Endless modes
- 1,321 phrases in English and Turkish, four categories, three difficulties
- Hints, plus two bonus hints for watching a rewarded ad
- Ranks, milestones, category badges and ten achievements, all stored on your iPhone
- Seven themes, all free
- A local profile with an editable name and avatar
- Banner and interstitial ads from Google AdMob, non-personalized
What it does not include
- No account or sign-in of any kind
- No in-app purchases and nothing to restore
- No way to remove ads
- No online leaderboards or Game Center
- No notifications or reminders
- No iPad or Android version
Requirements
- iPhone running iOS 17.0 or later
- Portrait orientation
- Rated 4+
- No internet connection needed to play; ads load when online
How your data is handled: privacy policy.
Common questions
- How do hints work?
- Easy puzzles start with three hints, Medium with two, Hard with one. When you run out, the hint sheet offers a short rewarded ad that adds two more. There is no other way to buy hints.
- I ran out of lives. Can I continue?
- Yes. On the game over screen, choose Watch ad to continue and one life is restored. You can also retry the puzzle, reveal the answer or start a new one.
- How often do ads appear?
- A banner sits under the puzzle. An interstitial can show after a completed puzzle, at most once every three puzzles and never more often than every five minutes. Rewarded ads only play when you ask for one.
- How do I reset my progress?
- Open Settings and choose Reset statistics. You will be asked to confirm. Deleting the app removes everything, since nothing is stored anywhere else.
- Why did my daily streak end?
- The Daily Challenge changes at midnight local time and the streak counts consecutive days with a completed daily puzzle. Solving two puzzles on the same day does not add a day.
- What is the music?
- Satie’s Gymnopédie No. 1 on the menus and the aria from Bach’s Goldberg Variations while you solve. Both are public-domain recordings from Musopen. You can turn music off in Settings.