Collatz Hailstone Link
A Collatz number-merge puzzle
Free · Designed for iPad. Not verified for macOS.
Collatz Hailstone Link — a relaxing number-merge puzzle built on one of math's most famous mysteries: the Collatz
conjecture (the "3n+1" problem).
Drag and merge numbered tiles, watch each sum bounce through the hailstone sequence, and chase the highest — or
lowest — final number you can reach. Easy to learn in seconds, deep enough to keep you coming back for a better
score.
HOW TO PLAY
• Drag one tile onto another (or tap one, then another) to merge them.
• The two values are added, then the Collatz rule is applied to the sum:
- Even sum → divide by 2 (the tile turns blue)
- Odd sum → multiply by 3 and add 1 (the tile turns orange)
• Chain the same color in a row to build a streak bonus.
• Keep merging until a single tile remains. Push that last value as high — or as low — as you can!
FEATURES
• Pure one-finger gameplay — merge with a drag or a tap.
• 7 board shapes: Square, Hexagon, Triangle, and four hybrid layouts.
• Three-part scoring: turn points, streak bonuses, and a final bonus based on your last number.
• Undo your recent moves to plan the perfect chain.
• Records screen — sort your runs by score, max value, final value, and date.
• Global online leaderboards — compete on both High Score and Final Max.
• Light & Dark themes.
• English & Korean language support.
• Play offline, anywhere — no account required.
WHY YOU'LL LOVE IT
A quick puzzle for a coffee break, a brain teaser for math lovers, and a satisfying score-chaser for everyone in
between. Every board is a fresh little puzzle in number theory — no two runs feel the same.
Merge the numbers. Ride the hailstones. Beat your best.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
* 2026/07/05 Version 0.6.0
- Bug fix
The developer, KwangHo Yun, 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 Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- KwangHo Yun
- Size
- 123.5 MB
- Category
- Puzzle
- Compatibility
Requires iOS 14.0 or later and a device with the A12 Bionic chip or later.
- iPhone
Requires iOS 14.0 or later and a device with the A12 Bionic chip or later.
• iPhone XS
• iPhone XS Max
• iPhone XR
• iPhone 11
• iPhone 11 Pro
• iPhone 11 Pro Max
• iPhone SE (2nd generation)
• iPhone 12 mini
• iPhone 12
• iPhone 12 Pro
• iPhone 12 Pro Max
• iPhone 13 Pro
• iPhone 13 Pro Max
• iPhone 13 mini
• iPhone 13
• iPhone SE (3rd generation)
• iPhone 14
• iPhone 14 Plus
• iPhone 14 Pro
• iPhone 14 Pro Max
• iPhone 15
• iPhone 15 Plus
• iPhone 15 Pro
• iPhone 15 Pro Max
• iPhone 16
• iPhone 16 Plus
• iPhone 16 Pro
• iPhone 16 Pro Max
• iPhone 16e
• iPhone 17 Pro
• iPhone 17 Pro Max
• iPhone 17
• iPhone Air
• iPhone 17e
• iPhone 18 Pro
• iPhone 18 Pro Max
• iPhone Duo - iPad
Requires iPadOS 14.0 or later and a device with the A12 Bionic chip or later.
• iPad Pro (11‑inch)
• iPad Pro (11‑inch) Wi‑Fi + Cellular
• iPad Pro (12.9‑inch) (3rd generation)
• iPad Pro (12.9‑inch) (3rd generation) Wi‑Fi + Cellular
• iPad mini (5th generation)
• iPad mini (5th generation) Wi‑Fi + Cellular
• iPad Air (3rd generation)
• iPad Air (3rd generation) Wi‑Fi + Cellular
• iPad Pro (11‑inch) (2nd generation)
• iPad Pro (11‑inch) (2nd generation) Wi‑Fi + Cellular
• iPad Pro (12.9‑inch) (4th generation)
• iPad Pro (12.9‑inch) (4th generation) Wi‑Fi + Cellular
• iPad Air (4th generation)
• iPad Air (4th generation) Wi‑Fi + Cellular
• iPad (8th generation)
• iPad (8th generation) Wi‑Fi + Cellular
• iPad Pro (11-inch) (3rd generation)
• iPad Pro (11-inch) (3rd generation) Wi‑Fi + Cellular
• iPad Pro (12.9-inch) (5th generation)
• iPad Pro (12.9-inch) (5th generation) Wi-Fi + Cellular
• iPad mini (6th generation)
• iPad mini (6th generation) Wi-Fi + Cellular
• iPad (9th generation)
• iPad (9th generation) Wi-Fi + Cellular
• iPad Air (5th generation)
• iPad Air (5th generation) Wi‑Fi + Cellular
• iPad (10th generation)
• iPad (10th generation) Wi‑Fi + Cellular
• iPad Pro (11‑inch) (4th generation)
• iPad Pro (11‑inch) (4th generation) Wi‑Fi + Cellular
• iPad Pro (12.9‑inch) (6th generation)
• iPad Pro (12.9‑inch) (6th generation) Wi‑Fi + Cellular
• iPad Air 11-inch (M2)
• iPad Air 11-inch (M2) Wi-Fi + Cellular
• iPad Air 13-inch (M2)
• iPad Air 13-inch (M2) Wi-Fi + Cellular
• iPad Pro 11-inch (M4)
• iPad Pro 11-inch (M4) Wi-Fi + Cellular
• iPad Pro 13-inch (M4)
• iPad Pro 13-inch (M4) Wi-Fi + Cellular
• iPad mini (A17 Pro)
• iPad mini (A17 Pro) Wi-Fi + Cellular
• iPad (A16)
• iPad (A16) Wi-Fi + Cellular
• iPad Air 11-inch (M3)
• iPad Air 11-inch (M3) Wi-Fi + Cellular
• iPad Air 13-inch (M3)
• iPad Air 13-inch (M3) Wi-Fi + Cellular
• iPad Pro 11-inch (M5)
• iPad Pro 11-inch (M5) Wi-Fi + Cellular
• iPad Pro 13-inch (M5)
• iPad Pro 13-inch (M5) Wi-Fi + Cellular
• iPad Air 11-inch (M4)
• iPad Air 11-inch (M4) Wi-Fi + Cellular
• iPad Air 13-inch (M4)
• iPad Air 13-inch (M4) Wi-Fi + Cellular - Mac
Requires macOS 11.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later and a device with the A12 Bionic chip or later.
- iPhone
- Languages
- English and Korean
- Age Rating
4+
- 4+
- Contains
Advertising
- Copyright
- © 2009-2026 Ariplanez
