# Gemdoku: Gem Logic Puzzle — One gem per row & color

> Calm logic puzzle placing gems with deduction, no guessing required. (iPhone/iPad app by Lunar Apps.)

- Source: https://appshunter.io/ios/app/gemdoku-gem-logic-puzzle/id6806572383 (this page in markdown: same URL + `.md`)
- Developer: [Lunar Apps](https://appshunter.io/developer/1796243791)
- Category: Games, Board, Puzzle
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 15.0 · 129 MB
- Languages: American English, Japanese, Brazilian Portuguese, Chinese (Simplified, China), European Spanish
- Released: 2026-09-08
- Data updated: 2026-10-03
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/gemdoku-gem-logic-puzzle/id6806572383/reviews.md

## What is Gemdoku?

Gemdoku is a calm, clever logic puzzle. Place exactly one gem in every row, every column and every colour region - and no two gems may touch, not even diagonally. Every level has a single solution you can reach by pure deduction: no guessing, ever.

HOW IT PLAYS
- Tap a tile to mark an X, swipe to mark several, double-tap to place a gem.
- Boards grow from 4x4 to 10x10 as you progress, with a HARD level every 10 levels.
- Hints explain the exact deduction, so you learn the techniques as you go.
- Three lives per level. Lose them all and you can retry any time.

EVERY DAY
- A Daily Challenge shared by every player - see how many you beat.
- A daily streak with a reward chest every 7 days.
- A weekly leaderboard of real players.

MADE FOR SHORT BREAKS
- Levels save mid-way, so you can pick up where you left off.
- Sound, voice and haptics you can turn off.
- No account needed.

Gemdoku is a fresh take on the Queens / Star Battle family of puzzles, built for one-handed play.

## Key features

- Pure deduction gameplay
- Board sizes up to 10x10
- In-game hints and tutorials
- Daily challenges and leaderboards
- Save progress mid-level
- Customizable sound and haptics


## Frequently asked questions about Gemdoku

### What is Gemdoku?

Gemdoku is a logic puzzle game where players place gems on a board, adhering to rules about rows, columns, and color regions. It emphasizes pure deduction to solve each level.

### How do you play Gemdoku?

You tap tiles to mark 'X', swipe to mark multiple, and double-tap to place a gem. The goal is to place exactly one gem in every row, column, and color region without any gems touching, even diagonally.

### Does Gemdoku have ads?

Yes, Gemdoku contains advertisements. It is a free-to-play game supported by ads.

### Is Gemdoku suitable for all ages?

Gemdoku is rated for ages 4 and up, making it suitable for a wide range of players. The puzzles are designed to be challenging yet accessible.

### Can I play Gemdoku offline?

The description does not specify offline play capabilities. However, features like daily challenges and leaderboards may require an internet connection.

### How often is Gemdoku updated?

Gemdoku was last updated on September 10, 2026, with version 1.0.1. Further update frequency is not detailed, but it is actively maintained.

### What devices support Gemdoku?

Gemdoku is currently supported on iPhones and iPods. Compatibility with other devices like iPads or Android phones is not mentioned.

### What makes Gemdoku unique?

Gemdoku offers a fresh take on puzzles like Queens and Star Battle, specifically designed for one-handed play. It guarantees a single solution per level reachable through pure deduction, eliminating guesswork.

## Version history (last 2 releases)

### 1.0.1 — 2026-09-10

Faster, smoother, and a few small fixes. Keep those streaks going!

### 1.0.0 — 2026-09-09

No release notes.

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All apps by Lunar Apps: https://appshunter.io/developer/1796243791

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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 2026-10-03.*