Byul: Star Logic

Brain-twisting daily logic puzzles. Place stars, follow three simple rules, beat the clock. No subscription, just a one-time purchase to remove ads forever.

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.