Japsum vs Loops

Japsum (short for "Japanese Sum") is a free, logic-based, combinatorial number-placement puzzle game. It’s similar to Kakuro or Sudoku puzzles, but with its own unique twist. Starting with an empty grid, you’ll use hints provided on the sides and top to place numbers or black boxes in the grid. The hints indicate the sums of consecutive numbers, with no black boxes in between. Multiple hints mean that sequences of numbers are divided by one or more black boxes. By using logical reasoning and interpreting these hints, you’ll make steady progress in filling in the grid with numbers and black boxes. Be prepared—especially with the larger grids, these puzzles can get very challenging! The app offers grid sizes ranging from 3x3 to 22x22—the largest puzzles of this kind, as far as I know. Every puzzle has exactly one unique solution, ensuring a fair and rewarding challenge. As you solve puzzles, your level increases, unlocking larger grids and fun bear avatars that you can choose to represent your progress. Best of all, Japsum is completely free—so you can dive into the world of Japanese Sum puzzles at no cost. Are you ready to test your logic and take on the ultimate puzzle challenge? Download Japsum today and start solving!

A new logic puzzle every day. Beautifully made. No ads, ever. Loops is a calm, premium puzzle game built around Slitherlink — the loop logic puzzle from Japan, beloved by puzzle fans for over thirty years and now reimagined for iPhone and iPad. The rules are simple. The grid hides one perfect loop. The numbers tell you how many of their four sides belong to it. Connect the dots, follow the clues, and find the only path that works. Every puzzle has exactly one solution. No guessing. No luck. Just clean, satisfying deduction — and that small, perfect "click" when the loop closes. TRAIN YOUR BRAIN, ONE LOOP AT A TIME Loops is a logic workout disguised as a beautiful little app. Solving it trains pattern recognition, working memory, spatial reasoning, and patience — the same mental muscles you flex with sudoku, crosswords, and chess puzzles. Ten quiet minutes a day is enough to feel sharper. WHAT MAKES LOOPS DIFFERENT • A new puzzle every day, free forever — hand-curated, never random. • Five difficulty tiers — from gentle five-minute warm-ups to Master puzzles that take a week. • Hints that teach — instead of revealing the answer, Loops explains the technique you missed. • Built like a real app — typography, haptics, sound, and motion crafted for focus. • Zero distractions — no ads, no pop-ups, no notifications begging you to come back. • Truly offline — play anywhere, no account required, no tracking. PERFECT IF YOU LOVE Sudoku · Wordle · daily logic puzzles · nonograms (Picross) · crosswords · Knotwords · Mahjong · Mini Metro · Monument Valley · or simply ten focused minutes a day. Never tried a loop puzzle before? Loops is built to teach you. The three-minute onboarding has no walls of text and no tutorials to skip — you'll solve your first puzzle by the end of it, and your brain will thank you. FREE FOREVER • A new daily puzzle every day, with Easy and Medium difficulties fully unlocked. • Five generated puzzles per day to keep you sharp. • Pencil marks, unlimited undo, and a mistake checker — always free. • Streak tracking, full statistics, and iCloud sync across all your devices. • Beautiful dark mode and accessibility-grade contrast. UNLOCK EVERYTHING — ONCE A single one-time purchase unlocks: • Every difficulty: Hard, Expert, and Master. • Unlimited generated puzzles. Never run out. • The full daily archive — every puzzle since launch. • All themes, including the hand-drawn Czech Folk theme. • Unlimited hints and lifetime mastery stats. One payment. Yours forever. No subscriptions, no ads, no dark patterns. FROM THE NIKOLI TRADITION Slitherlink — also called Fences, Takegaki, or Loop the Loop — was created by the legendary Nikoli puzzle house in Japan in 1989. Loops carries that tradition forward with the craft of a modern iOS app. MADE WITH CARE BY ONE INDEPENDENT CZECH DEVELOPER No team. No ad networks. No data harvesting. Just one developer trying to make the puzzle app he always wanted to play. Buy once, own forever, like apps used to be.