Junction Nine
Spin & Connect Puzzle
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
A puzzle backed by math. Spin the grid, connect every line. Every puzzle is verified solvable. But can you find the optimal solve?
Behind Junction Nine is a published mathematical result: in a 3×3 grid where any rectangle can be spun 180 degrees, every arrangement can be returned to order - and never in more than nine spins.
We designed the puzzles and independently calculated the fewest spins each one takes. See if you can match the minimum.
HOW IT WORKS
Spin any rectangular section of the grid 180°. Remember - squares count as rectangles. A move can shift several pieces at once, so fixing one connection can disrupt another.
Rotate tiles until every connection lines up. Then keep going: can you match the fewest possible spins?
Every puzzle has a proven minimum.
ORIGIN — FREE
Start with Origin, a collection that introduces the mechanic and builds from simple puzzles to genuinely tricky ones.
TRANSFER
Unlock a second collection with a new set of puzzles to master.
DESIGNED FOR THINKING
- No ads
- No timers or penalties
- Optional haptic feedback and sound
- Light and dark themes
- More puzzle packs planned
Quick to learn. Surprisingly hard to perfect.
Under-the-hood updates.
The developer, Bricks and Chips, LLC, 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 Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Purchases
- Identifiers
- Usage Data
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
- Location
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Bricks and Chips, LLC
- Size
- 60.2 MB
- Category
- Puzzle
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPad
Requires iPadOS 15.1 or later. - iPod touch
Requires iOS 15.1 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.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
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- All Access $16.99
- Transit Line Collection $9.99
- Terminus Puzzles $2.99
- Copyright
- © 2026 Bricks and Chips, LLC