AstroKnot

A puzzle a day keeps the brain in shape. Your brain is like any muscle: it stays sharp when you challenge it. AstroKnot gives you one fresh logic challenge every day, a Star Battle puzzle that can only be solved by reasoning, never by guessing. Ten focused minutes with a real deduction puzzle is a workout for attention, working memory and logical thinking, and it's a lot more fun than it sounds. THE PUZZLE Place the stars. Every row, every column and every region gets exactly the same number of stars, and no two stars may touch, not even diagonally. That is the whole rule set. The depth comes from the logic, and every puzzle has exactly one solution. YOUR DAILY WORKOUT • A new daily puzzle, the same for everyone, with streaks to keep you coming back • A weekly rhythm that mixes quick 7×7 boards with classic 10×10 ones, easy through master • A daily speed leaderboard through Game Center, with fair-play protection TRAIN, DON'T GUESS • Every puzzle is generated and graded by a solver that only uses human techniques • Five difficulty levels graded by the hardest technique the puzzle needs • Hints that teach: the board highlights what to look at, names the technique and explains why it follows • Undo, check, auto-marking of blocked cells, and a timer you can ignore WHEN YOU WANT MORE • Thousands of puzzles in three sizes: 7×7 with one star, 10×10 with two, 14×14 with three • Challenge a friend: share a puzzle with your time and see if they can beat it • Progress and settings sync across your devices with iCloud PAY ONCE The first 25 puzzles are free. After that the daily puzzle and one puzzle of your choice stay free, every day. A single purchase, Unlimited Puzzles, unlocks every puzzle and the full daily archive forever. No ads, no subscription needed, no energy meters. WORKS OFFLINE All puzzles are on your device. Train your brain on the train, on the moor, anywhere.