[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);

}

​

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;

      }

    }

  }

  stroke(255, 0, 0);

  if (won === true){

    background(0);

    stroke(255,255,255);

    fill(0);

    textAlign(CENTER);

    textSize(40);

    text("You Have 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 + 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 || c > 4 || c < 0){

    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);

    }

}