If your game only allows keyboard input, users with touchscreen devices may not be able to play. Use the gameButton object to add touchscreen-supported buttons.

buttonName = new GameButton(label); Creates a GameButton object called buttonName displaying the label value. The label value can include HTML code for more interesting buttons.
setPosition(x,y) Sets the button's upper-left corner to the indicated (x,y) coordinates. The coordinates are for the page, so buttons can be placed on the game scene or elsewhere on the page.
setSize(width, height) Changes the button's size. You may need to experiment to find the optimal button size for easy play without obscuring the screen.
isClicked() Returns true if the button is currently clicked and false if it is not. Provides an easy way to read the button's status in the game loop.