var see = 0

var transp

function setup() {

  createCanvas(400, 400);

  button = createButton('Show hint');

  button.position(272, 30);

  button.mousePressed(seee)

  //shows hint

}

​

​

function seee(){

  see++

  //sets transparency of rectangle to 0

}

​

​

function rectngle(){

  noStroke()

  fill(0, 0, 255, transp)

  rect(100, 0, 50, 15)

  fill(0)

  //creates rectangle over hint text box

}

​

​

function draw() {

  background(220);

  rectngle() 

  if (see <= 0){

    transp = 255

    rectngle()

  }

  else if (see >= 1){

    transp = 0

    rectngle()

  }

}