[false, false, false, false, false],

  [false, false, false, false, false],

  [true, false, true, false, true],

  [false, false, false, false, false],

  [false, false, false, false, false],

];

function setup() {

  createCanvas(400, 400);

  stroke(255, 0, 0);

}

​

function draw() {

  var won = true;

  for (var r = 0; r < grid.length; r++)

    for (var c = 0; c < grid[r].length; c++)

      if (grid[r][c] === true) won = false;

  if (won === true) {

    background(0);

    fill(255);

    stroke(0);

    textAlign(CENTER);

    textSize(30);

    text("Congratulations\nAll Lights Are Turned OFF!", 200, 200);

  } else drawGrid();

}

function mousePressed() {

  let col = int(mouseX / 80);

  let row = int(mouseY / 80);

  flipLight(row, col);

  if (isValid(row - 1, col) === true) flipLight(row - 1, col);

  if (isValid(row + 1, col) === true) flipLight(row + 1, col);

  if (isValid(row, col - 1) === true) flipLight(row, col - 1);

  if (isValid(row, col + 1) === true) flipLight(row, col + 1);

}

function flipLight(r, c) {

  grid[r][c] = !grid[r][c];

}

function isValid(r, c) {

  if (r < 0) return false;

  if (r > 4) return false;

  if (c < 0) return false;

  if (c > 4) return false;

  return true;

}

function drawGrid() {

  for (var r = 0; r < grid.length; r++)

    for (var c = 0; c < grid[r].length; c++) {

      let x = c * 80;

      let y = r * 80;

      if (grid[r][c] === false) fill(0);

      else fill(255);

      rect(x, y, 80, 80);

    }

}

​