Budbrain's Sudoku

Budbrain's Sudoku is a calm, fully offline 9x9 Sudoku game for Android.

★ Features
• 4 difficulty levels: Easy, Medium, Hard, Expert
• Every puzzle has a unique solution — solvable by pure logic
• Notes mode for pencil-mark candidates in any cell
• Hint and Undo buttons
• Optional auto-detection of conflicts
• Same-digit highlighting across the board
• Pinch or double-tap zoom (1–4×) for better readability
• Auto-save — pick up exactly where you left off
• Choose between a classic digit toolbar or a radial digit picker
• Achievements gallery with a snapshot of every solved board
• Calming background music
• Fully offline

★ How to play
1. Pick a difficulty
2. Tap an empty cell and choose a digit from the toolbar
3. In notes mode you can mark multiple candidates per cell
4. Fill every row, column, and 3×3 box with the digits 1–9, each used exactly once

★ Controls
• Tap a cell to select it
• Pinch or double-tap to zoom
• ↶ undoes the last move
• ? gives a hint when you're stuck

★ Accessibility
• Full TalkBack support with cell-by-cell announcements
• Generous zoom for low-vision players
• High-contrast palette on a dark background