[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(255);

          fill(0);

          stroke(0);

          textAlign(CENTER)

          textSize(30);

          text("congrats\nyou turned off all the lights!",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(255);

      else 

        fill(150,0,255);

      rect(x, y, 80, 80);

    }

}