# Byul: Star Logic — 매일 풀어보는 우주 별 퍼즐

> 매일 풀어보는 우주 별 퍼즐 (iPhone/iPad app by Jaehyeok Lee.)

- Source: https://appshunter.io/ios/app/byul-star-logic/id6775390129 (this page in markdown: same URL + `.md`)
- Developer: [Jaehyeok Lee](https://appshunter.io/developer/6775390131)
- Category: Games, Board, Puzzle
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 26.5 · 12 MB
- Languages: American English
- Released: 2026-06-04
- Data updated: 2026-07-19
- User reviews in markdown: https://appshunter.io/ios/app/byul-star-logic/id6775390129/reviews.md

## What is Byul?

A daily brain puzzle where you place stars in a starry night sky. One puzzle per day, the same for everyone in the world.

▣ THE RULES (3 lines, infinite depth)
A modern take on Star Battle, also known as "Two Not Touch":
• Place K stars in each row
• Place K stars in each column
• Place K stars in each bold-bordered region
• Stars cannot touch — not horizontally, vertically, or diagonally

That's it. Three rules. But the deduction chains run deep.

▣ MODES
• Daily Challenge — A new 10×10 Expert puzzle at midnight UTC. Everyone in the world solves the same one. Build your streak.
• Custom Play — Pick your size (5×5 to 10×10) and difficulty (Easy → Master). Five tiers of brain-bending.
• Resume Anywhere — Your in-progress game auto-saves. Pick up where you left off.

▣ NO AD HARASSMENT
• Daily Challenge is always ad-free
• Get a hint by watching one short ad — that's it
• Remove ads forever with a single one-time purchase
• No subscriptions, no upsells, no "premium tier"

▣ THIS IS FOR YOU IF
• You've solved Killer Sudoku Expert and want the next step
• You love NYT Games' "Two Not Touch" puzzles
• You miss the long deduction chains of Nikoli-style puzzles
• You want a focused 5 to 30 minutes a day for your brain

▣ TOOLS THAT RESPECT YOUR TIME
• Three input modes — Star, X-mark, Eraser — never more than one tap to switch
• Drag in X mode to paint multiple cells in one motion
• Unlimited Undo / Redo
• Instant red highlight when a placement violates the rules
• Hint system reveals one correct star at a time (via short reward ad)

▣ TRACK YOUR PROGRESS
• Solving time and total completions
• Best time per grid size
• Current streak and longest streak
• Compare your record against the global average

▣ MADE IN KOREA
Independent puzzle studio. Built for people who actually solve hard puzzles, not "casual brain games.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Ads | $9.99 | one-time |



## Version history (last 1 release)

### 1.0 — 2026-06-04

No release notes.

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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 2026-07-19.*