public void keyPressed(int keyCode, int rawKeyCode) {
        if (keyCode == GameCanvas.FIRE){
            MainMenu mainMenu = new MainMenu(engine);
            changeScene(mainMenu);
        } else if(keyCode == GameCanvas.LEFT){
            if(--page < 0) page = PAGE_NUMBER -1;
        } else if(keyCode == GameCanvas.RIGHT){
            if(++page >= PAGE_NUMBER) page = 0;
        }
    }