Akagram

Place bulbs to illuminate every open square. Light travels horizontally and vertically until it reaches a wall, and no two bulbs may shine directly at each other. Numbered walls indicate how many bulbs must touch their four sides. The numbers outside the board show the total bulbs required in each entire row and column.

Explore 930 puzzles on boards from 4×4 to 14×14, race the clock in Time Attack across three difficulty levels, or return for a new Daily Challenge. Every puzzle has a unique solution and is designed to be solved through logic. An interactive tutorial helps you learn the rules, while X marks, Undo, and Redo help you work through your deductions.

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Controls

• Mouse / Touch: Click or tap buttons and board squares.
• Bulb / X tools: Select a tool, then click or tap an open square to place its symbol. Repeat to remove it.
• Cycle tool: Click or tap to cycle through bulb → X → empty.
• Right-click: Use the opposite symbol with the Bulb or X tool, or cycle backward with the Cycle tool.
• Undo / Redo: Undo or restore your moves. Reset clears the current board.
• Satisfied clues: Click or tap a completed row, column, or wall clue to mark its remaining empty squares with X marks. Repeat to clear those marks.
• Zoom / Pan: Use the mouse wheel, pinch gesture, or zoom buttons to zoom. Drag the zoomed board to move around it.