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How to play

Light up every empty cell to solve the puzzle! Place bulbs so their light travels horizontally and vertically until it reaches a wall. Bulbs must never shine on each other. Numbers on walls show how many bulbs must be placed directly beside them, horizontally or vertically. Numbers outside the grid show how many bulbs belong in that row or column. Illuminate the entire board and satisfy every clue to win. Desktop Controls: Click a cell to place or remove a bulb. Select the × tool to mark cells where you think no bulb belongs. Right-click a cell to use the alternate action. Use the on-screen buttons to undo, redo, restart, or get a hint. Mobile Controls: Tap a cell to place or remove a bulb. Select the × tool to mark cells. Use the on-screen buttons to undo, redo, restart, or get a hint.