[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);

}

​

function draw() {

  let won = true;

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

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

      if(grid[r][c] === true)

        won = false;

  if(won === true){

    background(72,61,139);

    fill(0);

    textAlign(CENTER);

    textSize(24);

    text("You Win!", 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(72,61,139);

      else 

        fill(224,255,255);

      rect(x, y, 80, 80);

    }

}