Just Sum! Number Logic Puzzle
Math brain teaser, no timers
Free · Designed for iPad. Not verified for macOS.
From level 31, some tiles hide their number behind a "?" - the sums around them still tell you exactly what to do. No timers, no lives. Just logic, at your own pace.
Pick the numbers to keep. Land every sum exactly.
Just Sum! is a calm number puzzle built on one simple idea: every row, every column and every colored area has a target sum. Tap the numbers you want to KEEP, leave the rest behind, and the moment all your sums match, the level is solved.
You never have to guess. Every board is generated the moment you start it and verified by a solver, so there is exactly one solution — and pure logic will always get you there.
HIDDEN ? CELLS
From level 31, some tiles hide their number behind a "?". You still have to decide whether to keep them, using only the sums around them. Get it right and the number is revealed. It is the twist that keeps the bigger boards interesting.
FEATURES
• Endless levels that grow from a cozy 3x3 up to a demanding 10x10
• Every board freshly generated with a guaranteed unique solution
• Hidden ? cells unlock as you progress — from one per board up to six
• No timer, no lives, no game over. Mistakes are counted, never punished
• Stuck? Trade a rewarded ad for a hint that solves one cell for you
• Stats kept on your device: highest level, clears, flawless clears, best time per board size, total play time
• 7 achievements to chase, from reaching level 10 to 100 total clears
• Warm rounded visuals, with a dark mode that is genuinely bright and easy on the eyes
• Rich haptic feedback on every tap, every mistake and every completed line
• Boards are generated on your device, so you can keep playing offline
• iPhone and iPad, in English, Japanese, Korean, Spanish, Simplified and Traditional Chinese
HOW TO PLAY
1. Tap a number to keep it. Tap it again to undo
2. Match the target sum on every row, every column and every colored area
3. The numbers you never tap are the ones you erase
4. When all the sums line up, the level is clear
Thirty seconds or thirty minutes — pick up where you left off, and make it add up.
Free to play, supported by ads.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Stability and performance improvements under the hood.
Thanks for playing Just Sum! More updates are on the way.
The developer, Yuma Ueno, 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:
- Identifiers
Data Linked to You
The following data may be collected and linked to your identity:
- Location
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Yuma Ueno
- Size
- 8.3 MB
- Category
- Puzzle
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 5 more
- English, Japanese, Korean, Simplified Chinese, Spanish, Traditional Chinese
- Age Rating
4+
- 4+
- Contains
Advertising
- Copyright
- © 2026 Yuma Ueno
