NonaGrid

NonaGrid is a classic 9x9 Sudoku puzzle game that works completely offline — no account, no ads, and no internet connection required. Every puzzle is generated on your device and mathematically guaranteed to have exactly one solution, so you'll never get stuck on a broken grid. FOUR DIFFICULTY LEVELS Choose Easy, Medium, Hard, or Expert. Each level changes how many starting numbers you get and how much deduction it takes to finish — from a relaxed warm-up to a real challenge for experienced solvers. PLAY YOUR WAY • Tap a cell, then tap a number to fill it in • Pencil/notes mode for jotting down candidate numbers in a cell • Optional mistake highlighting flags entries that conflict with the solution, so you can catch errors as you go (or turn it off and play purist-style) • Unlimited undo and redo for every move • A hint button reveals one correct cell when you're stuck • A precise, pausable puzzle timer tracks how long each game takes TRACK YOUR PROGRESS NonaGrid keeps a local stats screen with games played, win rate, and your personal best time for every difficulty level — all stored only on your phone. LOOKS GOOD, DAY OR NIGHT Four appearance modes: System, Light, Dark, and a pure Black & White theme for maximum contrast. PRIVACY BY DESIGN NonaGrid never asks you to sign in, never shows ads, never connects to the internet, and never collects or transmits any personal data. Every puzzle, every stat, and every setting stays on your device. Whether you're a Sudoku beginner looking for gentle practice or a seasoned solver chasing a personal best, NonaGrid gives you an honest, distraction- free puzzle experience.