Light Up
Simon Tatham
Plays on mobile
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Also known as Akari, this puzzle has you place light bulbs on white squares until the whole grid is lit.
Each bulb shines along its row and column until it hits a wall, but no two bulbs may ever see each other. Numbers on black squares tell you exactly how many bulbs sit right next to them.
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Step 1: Left-click to place or remove a bulb.
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Step 2: Right-click puts a dot on a square to note that no bulb can go there.
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Step 3: Bulbs that can see each other are highlighted in red.
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Step 4: On touch screens a tap acts as a left click, a long press as a right click and a drag as a mouse drag.
- Keyboard
- Mouse
- Touch
Mouse
- Place · Remove
- Right click
Once the game starts, its controls are also shown on screen.
Full instructions
Left-click to place or remove a bulb. Right-click puts a dot on a square to note that no bulb can go there. Bulbs that can see each other are highlighted in red. On touch screens a tap acts as a left click, a long press as a right click and a drag as a mouse drag.
Credits and license
- Developer
- Simon Tatham
- License
- MIT
- Source
- chiark.greenend.org.uk/~sgtatham/puzzles/
- Attribution
- Light Up is part of Simon Tatham's Portable Puzzle Collection, copyright 2004-2024 Simon Tatham and contributors (MIT licence, full text in LICENCE).
This game is hosted under the terms of its license.
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