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.