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.