[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("Congratulations! 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>4 || r<0){

   return false;

 } 

 if (c>4 || c<0){

   return false;

 }else{

   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);

    }

}