Arrow keys, swipe, or tap a cell next to you, to move. Grab the white diamond, then make it back to the dashed start. Each colored orb flips its color's lasers once, then disappears. Grabbing the diamond trips the alarm: every laser turns on. A lit laser blocks its line, and standing in one traps you until you hit Undo.
Pick a tool, then click cells to place orbs or move the start/goal. With a color tool selected, click a strip beside the grid to place that color's beam along that row or column — click it again to remove it. Check "starts ON" to make that color's beam already lit at the start of the level, instead of waiting for a player to trigger it.
Sneak to the goal and back without tripping a beam
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