[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.length; c++) 

      if (grid[r][c]===true)

        won = false;

  if(won === true){

    background(200);

    fill("blue");

    stroke(0);

    textAlign(CENTER);

    textSize(30);

    text("Yay You Won",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,col-1)=== true)

    flipLight(row,col-1);

  if(isValid(row,col+1)=== true)

    flipLight(row,col+1);

  if(isValid(row+1,col)===true)

    flipLight(row+1,col);

}

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(50,50,150);

      else 

        fill(200);

      rect(x, y, 80, 80);

    }

}

​