Akari: Light Up Logic Puzzle

Akari (also known as Light Up) is a relaxing Japanese logic puzzle. Place light bulbs on the white squares so every white square is lit — by pure deduction, never guessing. Thousands of uniquely-solvable boards, a fresh daily challenge, and a calm, distraction-free design.

What is Akari?
Akari (灯, "light") is a classic Japanese logic puzzle from the makers of Sudoku, Nikoli. The rules are simple, the deductions are deep:
• Place bulbs so every white square is lit.
• Bulbs light their row and column until a wall blocks the light.
• No two bulbs may shine on each other.
• Numbered walls show how many bulbs touch them.

Every puzzle in this app has exactly one solution and is solvable by logic alone — never by guessing.

Features
• Unlimited puzzles — thousands of generated boards, no two the same.
• Four difficulties: Easy, Medium, Hard, Expert.
• Multiple grid sizes from 7×7 up to 11×11.
• A fresh daily puzzle with a streak counter.
• Full offline play — no internet, no account, no nag.
• Light & dark themes that follow your system.
• High-contrast mode and a colour-blind-safe palette.
• Cell states distinguished by shape AND fill — accessible by design.
• Smart hints when you're stuck (opt-in, never forced).
• Undo / redo and an auto-save that resumes exactly where you left off.
• Pinch-zoom and pan on large grids.
• Localized in 32 languages with proper font support for CJK, Arabic, Hindi, Thai and more.

Calm by design — and rating-safe
• No ads while you solve. Ever. The play screen has zero ad chrome.
• No timers pressuring you to rush. Train your brain at your own pace.
• A gentle completion celebration, then back to choosing your next puzzle.
• Optional sound and haptic feedback that you can fully disable.

Brain training that travels with you
A daily logic puzzle is one of the best low-effort habits for keeping your mind sharp. Akari works on the bus, on a flight, in waiting rooms — anywhere, offline.

Free to play
Akari is free. An optional one-time "Remove ads" purchase removes the completion-screen interstitial; the in-game experience already has no ads.

Light up the grid, anywhere. Free to play.