# Index Sums — Japanese Number Logic Puzzles

> Japanese number logic puzzle game based on row and column sums. (iPhone/iPad app by ZORIX LLC.)

- Source: https://appshunter.io/ios/app/index-sums/id6745894447 (this page in markdown: same URL + `.md`)
- Developer: [ZORIX LLC](https://appshunter.io/developer/1814371874)
- Category: Games, Productivity, Board, Puzzle
- Price: Free
- Rating: 5.00/5 from 3 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.6 · 25 MB
- Languages: English
- Released: 2025-05-20
- Data updated: 2026-06-24
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/index-sums/id6745894447/reviews.md

## What is Index Sums?

Challenge your mind with Index Sums (Kakurasu), an elegant Japanese number logic puzzle that combines the best of Sudoku and Nonograms!

HOW TO PLAY:
• Fill in the grid based on row and column sums
• Use logic to determine which cells should be filled
• Complete the puzzle to reveal a hidden pattern
• No guessing required - pure logic and deduction!

KEY FEATURES:
• Multiple difficulty levels (Easy, Medium, Hard)
• Daily challenges to keep your mind sharp
• Track your progress and statistics
• Beautiful, minimalist design
• Dark mode support
• Offline play capability
• Customizable themes and colors
• Haptic feedback for better interaction

BENEFITS:
• Mental Agility: Challenge your logical thinking and problem-solving skills
• Focus & Concentration: Practice maintaining focus through engaging puzzles
• Pattern Recognition: Develop your ability to spot patterns and make quick decisions
• Stress Relief: A relaxing way to unwind while keeping your mind active
• Daily Challenge: Build a fun routine with daily puzzles
• Progress Tracking: Monitor your improvement over time

GAME MODES:
• Classic Mode: Solve at your own pace
• Daily Puzzles: New challenges every day
• Practice Mode: Learn the basics

FEATURES:
• Intuitive touch controls
• Haptic feedback
• Progress tracking and statistics
• Level progression system
• Share your achievements
• No ads or interruptions
• Regular updates with new features

Whether you're a puzzle enthusiast or looking to improve your logical thinking, Index Sums offers the perfect blend of challenge and satisfaction. Download now and join thousands of players in this addictive number logic puzzle!

## Key features

- Row and column sum logic puzzles
- Multiple difficulty levels
- Daily challenges
- Progress tracking and statistics
- Offline play
- Customizable themes
- Haptic feedback

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/index-sums/id6745894447/reviews.md

### 5/5 — Nice game and great design

*2025-05-24*

Nice game and great design

## Frequently asked questions about Index Sums

### How do you play Index Sums?

Index Sums involves filling a grid based on the sums of its rows and columns. You use logic and deduction to determine which cells to fill, revealing a hidden pattern without any guessing.

### What are the game modes in Index Sums?

Index Sums offers Classic Mode for solving at your own pace, Daily Puzzles for new challenges each day, and Practice Mode to learn the basics of the game.

### Does Index Sums have ads?

No, Index Sums is completely ad-free, ensuring an uninterrupted and immersive puzzle-solving experience for all players.

### Can I play Index Sums offline?

Yes, Index Sums supports offline play, allowing you to enjoy the puzzles and train your mind anytime, anywhere, without needing an internet connection.

### What devices are supported by Index Sums?

Index Sums is available on iPhone and iPad devices, offering a seamless experience across Apple's mobile platforms.

### How often is Index Sums updated?

The app was last updated on September 28, 2025, with version 2.0.0, and the developer indicates regular updates with new features.

### What is the age rating for Index Sums?

Index Sums has an age rating of 4+, making it suitable for a wide range of players interested in logic puzzles.

### What makes Index Sums unique compared to other logic puzzles?

Index Sums combines elements of Sudoku and Nonograms with its unique row and column sum mechanic, offering a fresh challenge that relies purely on logic and deduction.

## Version history (last 5 releases)

### 2.0.0 — 2025-09-28

New interface

### 1.2.2 — 2025-07-01

Notification Improvement

### 1.1.2 — 2025-05-22

Various bug fixes and performance improvements

### 1.1.0 — 2025-05-21

• Updated How to Play guide with improved visual examples and clearer instructions
• Refined difficulty levels to focus on Easy (4x4) and Medium (6x6) puzzles
• Enhanced visual consistency across the game interface
• Improved scoring system with updated point values
• Better dark mode support throughout the app
• Various UI refinements and bug fixes

### 1.0.1 — 2025-05-20

No release notes.

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All apps by ZORIX LLC: https://appshunter.io/developer/1814371874

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-24.*