function setup() {

  createCanvas(400, 400); //canvas background

  rectMode(CENTER) //Alignment of cubes

}

​

function draw() {

  background(220); // Light gray background

  //Loop pattern

  for (var i = 0; i < 20; i++){ // Loop through 20 columns

    for (var j = 0; j < 20; j++){ // Loop through 20 rows

      //Position and Size of the square

      var x = i * 50 + 25

      var y = j * 50 + 25

      var d = 25

​

      //Changing color when pressed

      if (changeColor) {

        fill(random(255), random(255), random(255)); 

      } else {

        fill(i * j * 5); // Original color

      }

      rect(x, y, d) //Drawing the squares according to the variable

    // Random colors upon pressing

      let r = random(100, 255);

      let g = random(100, 255);

      let b = random(100, 255);   

    }

  }

}

​

function keyPressed() {

    if (keyCode === ENTER) // Pressing Enter Key

 changeColor = !changeColor; // Changes color of the square

​

}