//Check if StickerSheet has maximum amount of stickers allotted
  if (count_ == maxStickers_) {
    return -1;
  }

  //Iterate through array of stickers
  for (unsigned i = 0; i < maxStickers_; i++) {
    //Check for first existance of sticker, index of this denoted by "i"
    if (!stickerExists_[i]) {
      stickers_[i] = new Image(sticker); //Create a sticker copy from the reference parameter
      xCoord_[i] = x;  //Copy x-coord
      yCoord_[i] = y;  //Copy y-coord
      stickerExists_[i] = true;  //Update sticker exists value
      //Check if current index is greater than or equal to the highest free slot
      return i;
    }
  }
  return -1;