Logic Atlas

Logic Atlas is a logic-puzzle atlas built for people who want to actually get better at solving — not just fill grids by luck. Sudoku is the flagship. Bridges (Hashi) is the second region. Each has its own campaign, daily chart, and Quick Play. SUDOKU CAMPAIGN Work through a guided campaign that teaches real Sudoku techniques step by step, from Naked Singles and Hidden Singles through X-Wing, Swordfish, Jellyfish, Remote Pairs, and more. Each technique has a walkthrough, then easier and harder practice boards that need that move, so you build genuine solving skill instead of guessing. BRIDGES CAMPAIGN Learn Hashi the same way. Six techniques across three chapters — Harbor, Straits, and Archipelago — covering remaining-count fills, isolation traps, closed groups, and must-connect. Walkthrough, then easier and harder charts, with replay whenever you want more practice. DAILY PUZZLES A new Sudoku every day and a new Bridges chart every day, the same for every player. Come back to keep each streak going. QUICK PLAY Jump in without the campaign. Sudoku on 4×4, 6×6, and 9×9 from relaxed to expert. Bridges on 7×7 and 10×10. Optional hints when you get stuck. Points are awarded for Quick Play (and Daily) completions, not campaign practice. TRACK YOUR PROGRESS Stats, streaks, and achievements follow your solving history and celebrate milestones as your skills improve. DESIGNED FOR EVERYONE Full dark mode A low-stimulation visual mode that swaps bright colors for a calmer, muted palette Clean, distraction-free boards PRIVATE BY DESIGN No account or sign-in required. Your progress is stored only on your device — nothing is uploaded, collected, or sold. Join the community on Discord to share feedback, tips, and suggestions for future updates. Whether you are learning Sudoku for the first time, picking up Bridges, or looking to master advanced techniques, Logic Atlas grows with you.