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.