Neon Sudoku — Glow Puzzle Game

Crystal Software

In-app purchases

About this game

Solve puzzles your way — with neon glow, cool icons, and a game that adapts to your skill level.

CLASSIC SUDOKU
Fill the 9×9 grid so every row, column, and 3×3 box contains the digits 1–9. Choose Easy for a relaxing warm-up, or push yourself to Expert where only the toughest solving techniques will get you through. The game saves your progress automatically so you can pick up mid-puzzle anytime.

KILLER SUDOKU
No given cells. Just coloured cages with a target sum — and the challenge of figuring out which digits go where. The same Sudoku rules apply, but now your logic has to account for cage sums too. A whole new level of puzzle satisfaction when it clicks.

DAILY CHALLENGE
A brand-new Hard puzzle every day, the same for every player on the planet. Complete it, beat your personal best, and see how you rank against the world on the global leaderboard. Finish without any mistakes for a PERFECT badge.

🏆 GLOBAL LEADERBOARD
Sign in with Google and set a nickname to compete globally on the Daily Challenge. Scores are ranked by time with a 60-second penalty per mistake — so accuracy matters as much as speed. Your rank is shown even if you fall outside the top 100.

🧠 ADAPTS TO YOUR SKILL
After a few puzzles, Neon Sudoku learns your level and highlights the right difficulty for you. The more you play, the smarter the recommendation. You always choose freely — it's just there when you want a nudge.

🎨 CUSTOMISE WITH ICON PACKS
Swap the numbers for neon icons. Choose from the free Neon Icons pack, or unlock premium packs:
• Halloween — pumpkins, ghosts, bats & more
• Christmas — snowflakes, trees, stars & more
• Icon Pack 01 — stylish geometric symbols
Icons work in the grid, the number pad, and in notes mode too.

💡 SMART HINTS
Stuck? Tap HINT for a three-level clue system — a nudge, a targeted pointer, or a full technique explanation. Three free hints per game, then spend coins for more.

✏️ NOTES MODE
Place pencil candidates in any cell. Auto-remove notes clears impossible candidates as you fill in values nearby, keeping the grid clean without extra effort.

🪙 COINS & REWARDS
Earn coins every time you complete a puzzle. Harder puzzles and clean solves earn more. Spend coins on extra hints or buy coin packs in the store to keep the momentum going.

🏅 ACHIEVEMENTS & XP
Thirteen achievements across milestones, skill challenges, difficulty firsts, and play streaks. Earn XP to level up — shown right on the home screen.

☁️ CLOUD SYNC
Sign in with Google to back up your progress. XP, achievements, coins, and unlocked packs all sync automatically across devices. Played as a guest first? Sign in and everything carries over — nothing is lost.

⚙️ FULLY CUSTOMISABLE
• Sound effects & haptic feedback
• Show or hide mistakes in real time
• Highlight matching numbers and related cells
• Auto-remove pencil notes
• Number-first or cell-first input mode

Neon Sudoku is free to download and play. Icon packs and coin bundles are available as optional in-app purchases.

Download now and see if you can master all four difficulty levels — or top the daily leaderboard.

What’s new

🚀 Welcome to Neon Sudoku!

• Classic Sudoku — Easy, Medium, Hard & Expert
• Killer Sudoku — cage sums, no given cells
• Daily Challenge with global leaderboard
• Adaptive difficulty — the game learns your level
• Premium icon packs — Halloween, Christmas & more
• Cloud sync & achievements
• Sound effects and notes mode

Thanks for playing — feedback welcome!