public void act()
    {
        if (!loadingScreenAdded)
        {
            addObject(new LoadingScreen(), getWidth() / 2, getHeight() / 2);
            loadingScreenAdded = true;
        }
        if (playing)
        {
            if (Greenfoot.isKeyDown("e") || Greenfoot.isKeyDown("["))
            {
                paused = true;
                playing = false;
                Actor pauseMenu = new Actor() {};
                pauseMenu.setImage(new GreenfootImage(600, 300));
                pauseMenu.getImage().setColor(Color.BLACK);
                pauseMenu.getImage().fillRect(0, 0, 600, 300);
                pauseMenu.getImage().setColor(Color.GRAY);
                pauseMenu.getImage().fillRect(20, 20, 560, 260);
                pauseMenu.getImage().setColor(Color.WHITE);
                pauseMenu.getImage().setFont(pauseMenu.getImage().getFont().deriveFont(Font.BOLD));
                pauseMenu.getImage().setFont(pauseMenu.getImage().getFont().deriveFont(30.0F));
                pauseMenu.getImage().drawString("The game is paused.", 20, 50);
                pauseMenu.getImage().drawString("Press E or [ to continue playing.", 20, 100);
                pauseMenu.getImage().drawString("Press enter to return to the title screen.", 20, 150);
                addObject(pauseMenu, getWidth() / 2, getHeight() / 3);
            }

            if (!playerBlueAlive && !playerRedAlive)
            {
                //Greenfoot.stop();
                playing = false;
                Actor scoreDisplay = new Actor() {};
                scoreDisplay.setImage(new GreenfootImage(600, 300));
                scoreDisplay.getImage().setColor(Color.BLACK);
                scoreDisplay.getImage().fillRect(0, 0, 600, 300);
                scoreDisplay.getImage().setColor(Color.GRAY);
                scoreDisplay.getImage().fillRect(20, 20, 560, 260);
                scoreDisplay.getImage().setColor(Color.WHITE);
                scoreDisplay.getImage().setFont(scoreDisplay.getImage().getFont().deriveFont(Font.BOLD));
                scoreDisplay.getImage().setFont(scoreDisplay.getImage().getFont().deriveFont(30.0F));
                scoreDisplay.getImage().drawString("You were mauled by zombies!", 20, 50);
                scoreDisplay.getImage().drawString("Time: " + time / 62 + " seconds.", 20, 100);
                scoreDisplay.getImage().drawString("Press enter to return to the title screen.", 20, 150);
                addObject(scoreDisplay, getWidth() / 2, getHeight() / 3);
            }

            time++;
        }
        else
        {
            if (!playerBlueAlive && !playerRedAlive && "enter".equals(Greenfoot.getKey()) || paused && "enter".equals(Greenfoot.getKey()))
            {
                removeObjects(getObjects(null));
                
                playerBlueX = 0;
                playerBlueY = 0;
                playerRedX = 0;
                playerRedY = 0;
                playerBlueWeapon = 0;
                playerRedWeapon = 0;
                playerBlueAlive = true;
                playerRedAlive = false;
                playing = false;
                players = 1;
                
                setPaintOrder(LoadingScreen.class, Button_Singleplayer.class, Button_Multiplayer.class, TitleScreen.class, Timer.class, ComboDisplay.class, BackItem.class, Player_Blue.class, Player_Red.class, Player_Arms.class, Sword.class, Trail.class, Explosion.class, ExplosionSmall.class, Zombie.class, Grenade.class, Bullet.class, Shield.class, Weapon.class, Bomb.class, Medpack.class);

                Player_Blue playerBlue = new Player_Blue();
                addObject(playerBlue, getWidth() / 2 - 20, getHeight() / 2);
                playerBlue.setRotation(180);

                addObject(new Lifebar(playerBlue), getWidth() / 2 - 20, getHeight() / 2);

                addObject(new TitleScreen(), getWidth() / 2, getHeight() / 2);
                addObject(new Button_Singleplayer(), 550, 300);
                addObject(new Button_Multiplayer(), 550, 400);

                addObject(new Timer(), getWidth() - 120, 40);
            }
            if (paused && "e".equals(Greenfoot.getKey()) || paused && "[".equals(Greenfoot.getKey()))
            {
                removeObjects(getObjects(Actor.class));
                playing = true;
                paused = false;
            }
        }
    }