Deduction Isles: Map Puzzle

One dispute. One island map. Move the tide, trace boat routes, and test every claim against daylight. Win by proving which crossing was physically impossible. Deduction Isles is a tactile daily logic game built around route feasibility. Every case combines an invented island chart with vessel limits, tide windows, travel times, and observations. Follow the evidence, rule out what could not have happened, and make your finding. WHAT YOU’LL DO • Solve a different island case each day • Explore 365 generated cases with solver-verified unique answers • Scrub time and tide to see when channels open or close • Compare routes, travel times, capacity, daylight, and witness claims • Use layered Socratic questions when you want a nudge instead of an answer • Fill a forgiving weekly passport and revisit solved charts in the archive • Choose light or dark charts, larger text, high contrast, and gentler motion HOW ACCESS WORKS A three-day access window opens all 365 shipped cases. When the window ends, today’s case remains available. A one-time purchase unlocks the complete archive. The purchase screen displays the price supplied by your storefront before you buy, and previous purchases can be restored. No accounts. No ads. No analytics or developer data collection. Progress is stored on your device and may be included in your Google-account-protected Android backup. The developer cannot access it. All islands, routes, vessels, tides, and disputes are fictional.