How to solve Akari
Light every cell with bulbs
LinkedIn のデイリーゲームで人気になったパズル Akari を、もう一局遊びたくなったことは？ ここなら無制限。無料の盤面がその場で生成され、3段階の難易度と一意の解が保証されています。
遊び方： Akari
- Place light bulbs on white cells so that every white cell is lit.
- A bulb lights its whole row and column until a black cell blocks the light — but two bulbs may never shine on each other.
- A number on a black cell says exactly how many bulbs touch it horizontally and vertically.
- Black cells without a number are plain walls — they don't constrain anything.
- Tap a cell to place a bulb, again for a dot (no bulb here), once more to clear.
How to solve Akari: techniques that work
Open every board with the extreme clues. A wall numbered 4 lights bulbs on all four sides; a 0 forbids bulbs on all its neighbours — mark those cells with dots at once. A 3-wall in the open, or a 2-wall in a corner, is fully forced too. These free moves light a surprising share of the grid before any real thinking starts.
Then hunt for cells that only they themselves can light. A white cell whose row and column segments are otherwise dotted out or blocked by walls must hold a bulb — no other bulb can ever reach it. This "self-light" argument is the workhorse of midgame Akari.
Dots are half the game. Every cell a bulb shines on is dotted by the app automatically through its light ray, but add your own dots wherever a bulb would break a satisfied wall clue or stare down an existing bulb. The more dots you place, the more self-light cells appear.
Common mistakes
Placing two bulbs in the same corridor: bulbs must never shine on each other, and a single long row with two bulbs and no wall between them invalidates the board even if everything is lit.
Treating unnumbered walls as clues. Black cells without a number impose nothing — they only block light. Their job is to cut long corridors into short segments.
From easy to hard
On easy boards every wall is numbered, so clue-chaining carries you through. Medium and hard boards leave walls blank and stretch the corridors: expect to lean on the self-light argument and on careful dotting. Akari is Nikoli's Light Up (美術館) — one of the most elegant deduction puzzles ever designed.
FAQ
- LinkMyPzzl の Akari は無料・無制限ですか？
- はい。Akari の盤面はブラウザ内でその場で生成されます。アカウント不要・無料で、好きなだけプレイできます。
- 毎日の Akari パズルと何が違いますか？
- LinkedIn で人気になったデイリー版は1日1問だけ。LinkMyPzzl は盤面を無制限に生成し、難易度も選べます。
- Akari の盤面には必ず一意の解がありますか？
- はい。ソルバーが生成された全盤面を検証します。解は常にただ1つです。
- What are the black cells without numbers?
- Plain walls. They block light and split rows into segments but impose no constraint of their own — any number of bulbs may sit next to them.
- Why is my board wrong when everything is lit?
- Almost always two bulbs shining on each other along a clear row or column, or a numbered wall touching the wrong count of bulbs. Both must be fixed for the win, not just full lighting.