Every puzzle begins as a cracked marble tablet, and the only question that matters is which number 🔢 the logic actually forces - not which one you can get away with guessing. Treasure Gems builds each grid by construction 🏗️ rather than by chance: a full solution is generated, clues are removed only while the puzzle stays uniquely solvable, and difficulty 📏 is shaped by how many are taken away. Choose one of six variants - Classic, Diagonal, Hyper, Jigsaw, Mini 4x4 or Mini 6x6, each with its real rules enforced - and one of six tiers from Beginner 🌱 to Master, and the tablet is carved to order.

At the board, numbers 🔢 are set into engraved stone, entered digits glow with celestial blue, and a wrong ❌ move is marked at once. When you are stuck, a hint does not simply drop a correct number: it names the technique - Naked Single, Hidden Single, Naked Pair or Locked Candidates - and explains the deduction behind it, falling back honestly to a revealed candidate only when no basic method applies. Notes 📝, a number lock for repeated entry, undo and redo, an optional mistake limit and an Analyze panel that reports conflicts and progress 📈 are all within reach. Complete the grid and the tablet is restored in light.

Between games the Learning Library 📚 teaches those same techniques across seven interactive lessons, each with a worked board and a short exercise you must answer to finish it. The Training Grounds sharpen them under pressure - Find the Single, Candidate Practice 🏋️, Conflict Detection, a timed Speed ⚡ Round, and a Mistake Review assembled from the very cells you got wrong ❌ in real play.

Build 🔨 your own in the Puzzle Creator: place givens on any grid size, confirm the puzzle has exactly one solution, preview the answer, then save 💾 it to play ▶️ or edit later. The Puzzle Journal keeps the puzzles you meet in the world - photograph a printed grid or import 📥 one from your library, rotate it, transcribe it into an editable board, add notes, and turn a valid transcription straight into a playable custom puzzle.

Progress 📈 is kept together. A deterministic Daily Challenge sets one puzzle per day on a month 🗓️ calendar 📅 that marks solved, missed and locked days and carries a running streak 🔥. Statistics chart games, win rate, streaks, best times by difficulty, mistakes, hints and perfect solves, filterable by range and by variant. Twenty honours across progress, streak, skill, learning, variants and journal each carry a real unlock condition and an experience reward, and six themes re-skin the whole sanctuary - several of them earned with the relics those honours grant. An Oracle's Challenge reads your record and hands back a real, playable goal.

Everything runs on the device 📱, with nothing to sign up for and no connection required. Photographs, journal entries, custom puzzles, statistics 📊 and all progress 📈 can be reset or removed at any moment.

Key features in Treasure Gems:- Puzzles generated with a guaranteed solution across six variants - Classic, Diagonal, Hyper, Jigsaw, Mini 4x4 and Mini 6x6 - and six difficulty 📏 tiers from Beginner to Master
- Explained hints that name the technique - Naked Single, Hidden Single, Naked Pair, Locked Candidates - instead of just filling a cell
- A carved-marble board with notes 📝, a number 🔢 lock, undo and redo, an optional mistake limit and an Analyze panel for conflicts and progress 📈
- Seven interactive lessons with worked boards and exercises, tracking your technique completion
- Five training drills, including a timed Speed ⚡ Round and a Mistake Review drawn from cells you actually got wrong ❌
- A Puzzle Creator with uniqueness checking, solve preview and save 💾, edit and play ▶️ on any grid size
- A Puzzle Journal that photographs or imports a printed grid, transcribes it, and converts a valid transcription into a playable puzzle
- A deterministic Daily Challenge with a month 🗓️ calendar 📅 of solved, missed and locked days and a running streak 🔥