[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]

  ];

var s;

var t;

var u;

function setup() {

  createCanvas(400, 400);

  stroke(176, 38, 255);

  frameRate(5);

}

​

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) // there is a light on

        won = false;

  if (won === true){

    background(0);

    fill(s,t,u);

    fill(t,u,s);

    fill(u,t,s);

    s = random(0,255);

    t = random(0,255);

    u = random(0,255);

    stroke(0);

    textAlign(CENTER);

    textSize(25);

    text("Congrats!\nYou've managed to\nturn off all the lights!", 200, 150);

  }else

  drawGrid();

}

function mousePressed() {

  if(mouseX >= 400 || mouseY >= 400 || mouseX <=0 || mouseY <= 0)

    return;

  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){

  /* your code here */

  if (r < 0 || r > 4)

    return false;

  if (c < 0 || 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);

    }

}

​