Light Up 美術館
Akari Puzzle
Light every white square. Keep each bulb out of sight of the others.
How to play Akari
Akari is a Japanese logic puzzle, also called Light Up. Select Play Akari to load a 7×7 board here. Choose Practice 3×3 inside the player to work through a smaller board.
Follow the light
Place a bulb on a white square. It lights its row and column until a black wall or the edge of the board stops the beam.
Read the walls
A number counts bulbs touching the wall above, below, left or right. Corners do not count. A wall with no number simply blocks light.
Check each beam
Light beams may cross in an empty white square. Two bulbs cannot shine directly on one another. To finish, light every white square, satisfy each numbered wall and clear any bulb conflicts.
Your first four bulbs
Choose Practice 3×3. The central 4 needs a bulb on every side. Place the top and bottom bulbs first. The wall between them keeps them from seeing one another.
Now fill the left and right squares. Their beams light the four corners. You have solved the whole board without placing a bulb in a corner.
Find the next move on a 7×7 board →Player questions
How do I mark a square on my phone?
Turn on Mark mode and tap a white square to add a dot. Tap again to remove it, or turn Mark mode off to place bulbs. A dot is a note to yourself and can still be lit by a bulb elsewhere.
What do the keyboard and mouse controls do?
Click a white square to toggle a bulb. Right-click toggles a mark. With the board focused, use the arrow keys to move, Enter for a bulb and Space for a mark. Undo and Redo let you review a deduction.
Can I recover from a mistake or start again?
Use Undo for the last move or Restart board to clear the current grid. New 7×7 opens another puzzle. Keep the tab open to keep working on the same position.
Why does an illuminated board still look unfinished?
Check each numbered wall and look along each uninterrupted row and column for two bulbs. Covering all the white squares satisfies only one of the three rules.
Light Up by James Harvey, from Simon Tatham’s Portable Puzzle Collection. The puzzle was introduced by Nikoli.