Lights Out 5×5 — Set 10

Lights Out: 5x5 Grid #10

Title

Lights Out: 5x5 Grid #10

Grid

• [0,0,1,1,1]
• [1,1,0,1,1]
• [0,0,1,1,0]
• [0,1,0,1,0]
• [1,1,0,0,1]

Solution

• {"row":2,"col":1,"label":"C2","description":"Press cell C2 (row 3, column 2)."}
• {"row":4,"col":0,"label":"E1","description":"Press cell E1 (row 5, column 1)."}
• {"row":0,"col":3,"label":"A4","description":"Press cell A4 (row 1, column 4)."}
• {"row":2,"col":0,"label":"C1","description":"Press cell C1 (row 3, column 1)."}
• {"row":2,"col":4,"label":"C5","description":"Press cell C5 (row 3, column 5)."}
• {"row":3,"col":4,"label":"D5","description":"Press cell D5 (row 4, column 5)."}

SolutionPressCount

6

Question

The grid below shows lights that are ON (●) and OFF (○). Pressing any cell toggles it AND all adjacent cells (up, down, left, right). Find the sequence of presses that turns ALL lights off.

Rules

• Pressing a cell toggles its state and the state of all orthogonally adjacent cells.
• Your goal is to turn all lights off.
• The grid is 5×5. Rows are labeled A–E, columns 1–5.
• The order of presses does not matter — any order of the correct cells works.
• Pressing the same cell twice returns it to its original effect (so no cell needs pressing more than once).

Hint

The minimum number of presses is 6. Try working row by row from top to bottom.