GridMind: Sudoku & Killer

GridMind: Sudoku & Killer Sudoku
Free sudoku puzzle game. Play offline, no wifi needed. Classic Sudoku and Killer Sudoku in one clean app - from Beginner to Master.

TWO PUZZLE TYPES, ZERO COMPROMISE:
• Classic Sudoku - the timeless 9×9 number puzzle across six difficulty levels: Beginner, Easy, Medium, Hard, Expert, and Master
• Killer Sudoku - cage-based variant where groups of cells must sum to target values. A fresh challenge even for seasoned solvers.

SMART HINTS THAT TEACH:
Stuck on a hard sudoku puzzle? GridMind's multi-stage hint system teaches you the technique, not just the answer. Get a nudge toward the right region, a pointer to the specific cell, or a full explanation of why the move works. Learn Naked Pairs, X-Wings, Swordfish, and more - while you play.

DAILY CHALLENGES:
Two fresh sudoku puzzles every day - one Classic, one Killer. Identical for all players worldwide. Complete them to earn bonus stars and keep your daily streak alive.

EARN & SPEND STARS:
Complete puzzles to earn stars. Spend them on hints, streak freezes, and premium themes. No pay-to-win - everything is earnable through play. The full game is free.

BEAUTIFUL THEMES:
Five hand-crafted board themes:
• Classic - clean white with blue highlights (free)
• Midnight - dark gray with amber accents (free)
• Ocean - deep blue with cyan highlights
• Forest - sage green with warm earth tones
• Paper - cream sepia with a notebook feel

TRACK YOUR PROGRESS:
• Daily streak with freeze protection
• 20 achievements to unlock
• Detailed stats: best times, averages, win rate, solve history
• Auto-save - resume any puzzle exactly where you left off
• Skill progression tracking across all six difficulty levels

FULLY CUSTOMISABLE:
• Error highlighting: instant (strict), check-on-demand, or off
• 3-mistake limit mode for added tension
• Number-first input for power users
• Timer visibility toggle
• Auto-clean pencil marks
• Colorblind mode with shape indicators
• Haptic feedback

CLEAN, DISTRACTION-FREE DESIGN:
The board dominates the screen. No clutter. Large touch targets. Smooth animations. A sudoku app that gets out of your way and lets you think.

OFFLINE. FREE. NO ACCOUNT.
All game data is stored locally on your device. Play anywhere - no internet, no wifi, no sign-up required. GridMind works completely offline. No ads in beta.