Crux: Daily Logic Puzzles
Daily Logic Puzzles
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Challenge your mind with new logic grid puzzles every day. Track streaks, earn achievements, and enjoy a rich variety of themes and special modes. No ads. Play offline.
Crux (n.): a puzzling or difficult problem; an unsolved question.
Crux is a daily logic-grid puzzle app for people who enjoy thinking things through. Each puzzle is a classic deduction grid (the kind you may know as an Einstein or Zebra puzzle): read the clues, eliminate what cannot be true, and work out how everything fits.
SEVERAL NEW PUZZLES EVERY DAY
Each day brings fresh grids across multiple difficulties, from the quick Hunch up through Expert, with richer clue types as the challenge grows. Optional narrative themes turn categories into short story clues, so the same logical workout feels different from day to day. Build streaks, earn achievements, and track your progress over time.
PLAY THE PAST
Browse the Archive to replay puzzles from earlier days. Premium unlocks the full history since launch.
FAIR PRICING
'Red Herring' mode includes one or more fake clues to throw you off, while 'Deadline' is a time trial.
BUILD YOUR OWN
Crux is also a puzzle engine.
• Create unique grids in the Custom Builder
• Customize theme, difficulty, and size
• Control auto-generated clues or craft them step by step
• Save favorites to replay anytime
• Share custom puzzles with others
LEARN THE LOGIC
New to logic grids? The interactive tutorial walks you through cross-referencing and elimination until the method clicks.
DESIGNED WITH CARE
• Clean, focused interface with dark and light mode
• Check answers as you go (Premium)
• Optional streak reminders so you do not lose a run
• Six languages: English, German, Spanish, French, Italian, Portuguese
• Curated puzzle packs to work through at your own pace
• Export puzzles to PDF to print and share
• Works offline. Great for commutes and travel
• No ads
• Optional analytics. You choose whether to share usage data
FAIR PRICING
Crux is free to download with daily puzzles included. One optional, one-time Premium purchase unlocks everything below across your devices. No subscription.
• Full Daily Archive
• Unlimited Custom Builder
• Mid-puzzle answer checking
• Print and PDF export
• Hard and Expert daily puzzles
• More puzzle packs
Sharpen your mind. Find the connections. Solve the Crux.
Ratings & Reviews
- New 'Deadline' game mode: solve as many puzzles as you can before time runs out!
- Statistics page: compare your performance against others
- Premium users can now share puzzles from the custom puzzle builder
- New achievements
The developer, Josh Hills, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Location
- Contact Info
- Identifiers
- Usage Data
- Other Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
For more information, visit the developer’s accessibility website .
Information
- Seller
- Josh Hills
- Size
- 84.2 MB
- Category
- Puzzle
- Compatibility
Requires iOS 16.4 or later.
- iPhone
Requires iOS 16.4 or later. - iPad
Requires iPadOS 16.4 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later. - Apple Watch
Requires watchOS 10.0 or later.
- iPhone
- Languages
- English
- Age Rating
13+
- 13+
- Infrequent
Cartoon or Fantasy Violence
Horror/Fear Themes
Alcohol, Tobacco, Drug Use or References
- In-App Purchases
Yes
- Crux Premium $1.99
- Copyright
- © 2026, Josh Hills