Preserve™ vs SudoEarth

Preserve is free to download with no ads. In-app purchases are required to unlock the full experience. Restore the wild. One tile at a time. Preserve is a peaceful puzzle game that lets you build entire ecosystems through clever placement of flora and fauna cards. Whether you're growing a forest, cultivating a wetland, or balancing food chains in a meadow, your decisions shape how each biome evolves. Enjoy multiple game modes tailored to your mood—complete challenges in Puzzle mode, build freely in Creative, or find balance in classic mode. With its serene soundtrack, charming visuals, and relaxing yet rewarding gameplay loop, Preserve is a unique digital escape for the minds. - Grow living biomes by matching flora and fauna synergies - Multiple gameplay modes: Puzzle, Classic and Creative - Unlock natural wonders and discover secret patterns - Soothing visuals and relaxing soundtrack - Fully offline, no ads. Relax. Reconnect. Rewild the world.

SudoEarth is a calm, zen-aesthetic sudoku game. No ads. No trackers. No notifications. Just sudoku, painted in watercolor across five real geographies — Iceland, Kyoto, Tuscany, Norway, and Scotland. A SUDOKU WORLD TOUR Each chapter is a place. Iceland's aurora-lit fjords. Kyoto's bamboo grove. Tuscany's honey hills. Norway's cold-blue waterfalls. Scotland's misty highlands. Solve 30 puzzles in each chapter to complete the journey. 150 hand-tuned puzzles in version 1.0, every one verified to have a unique solution. MIRA — A GENTLE COACH Stuck on a puzzle? Mira, your in-game guide, offers three-tier progressive hints — direction first, then technique, only the answer if you ask twice more. The hint flow respects your pace: nothing is given before you've asked. Mira's tier-3 ground-truth gate means the answer is always correct, never an AI guess. WILDLIFE COLLECTION Each chapter has a hand-painted anchor wildlife — Arctic fox, Japanese macaque, Tuscan owl, Norwegian reindeer, Scottish wildcat. Complete a level to unlock the painting. Walk into the Wildlife tab anytime to see your collection. DESIGNED FOR CALM SudoEarth's design language is rice-white paper, soft watercolor washes, italic serif chapter titles, hand-drawn ink icons. No saturated alarming red anywhere — even the "out of hints" state lands on warm gold, not shouty red. The whole app is locked to light mode for now, deliberately, to match the airy notebook feel. OFFLINE-FIRST Every puzzle works offline. The rule-engine fallback means even Mira's hints work without a network — your hints just route locally instead of through our server. Your puzzle progress is saved locally first, then optionally synced to your other devices via Apple Sign-in. PRIVACY-FIRST We do not track you. We do not sell your data. We do not show ads. SudoEarth uses Apple Sign-in's anonymous identifier — we never see your name or email. Crash diagnostics use Firebase Crashlytics with no personal information attached. Full details at sudoearth.app/privacy. PREMIUM SUBSCRIPTION Free play comes with 3 Mira hints per day. SudoEarth Premium unlocks unlimited Mira hints. Two plans — Monthly and Yearly. Both are auto-renewable subscriptions and renew unless cancelled at least 24 hours before the period ends; you can cancel anytime in iOS Settings → your name → Subscriptions. The yearly plan offers the best per-month value. REQUIREMENTS - iOS 26 or later - iPhone or iPad - Optional: Apple Sign-in for cross-device sync LINKS - Privacy Policy: https://sudoearth.app/privacy - Terms of Service: https://sudoearth.app/terms - Support: support@sudoearth.app Auto-renewable subscription terms and conditions: SudoEarth Premium subscriptions automatically renew unless turned off at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period at the rate displayed at purchase. You can manage and cancel your subscription by going to iOS Settings → Apple ID → Subscriptions after purchase.