Akari

Light Up. Bulbs on white cells; numbers constrain neighbors.

About

Akari / Light Up — a Nikoli constraint puzzle on a 10×10 grid. Place bulbs on white cells so every white cell is illuminated, no bulb illuminates another, and every numbered black cell has exactly its labelled number of bulbs in its 4-orthogonal neighbors. Bulbs illuminate their entire row and column until blocked by a black cell or the grid edge.

How to play

Arrow keys move the cursor; Space toggles a bulb on the current white cell; X toggles a 'no-bulb' annotation (mutually exclusive with bulb). Win when every white cell is illuminated, no bulb shares an unobstructed row/column with another bulb, and every numbered black cell has exactly N bulbs in its 4-orthogonal neighbors.

Features

• 10×10 grid with black/white cell mix
• Numbered black cells (0–4) constraining neighbor bulb counts
• Bulb annotation and no-bulb annotation modes
• Unique-solution generation
• Constraint-propagation solver
• Two-color palette rendering

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