import greenfoot.*;

public class Circle extends Actor
{
    GreenfootImage upImage = new GreenfootImage("upImage.png"); // adjust filename as needed
    GreenfootImage downImage = new GreenfootImage("downImage .png"); // adjust filename as needed
    boolean spaceDown;

    public Circle()
    {
        setImage(upImage);
    }

    public void act()
    {
        if (spaceDown != Greenfoot.isKeyDown("space")) // was there a change in state of key
        {
            spaceDown = !spaceDown; // save new state
            if (spaceDown) // is down the new state
            {
                setImage(downImage);
                ((Game)getWorld()).bumpScore(); // pseudo-code to have world increment score counter; adjust as needed
            }
            else setImage(upImage);
        }
    }
}

import greenfoot.*;
 
public class Circle extends Actor
{
    GreenfootImage unpressed = new GreenfootImage("unpressed.png"); // adjust filename as needed
    GreenfootImage pressed = new GreenfootImage("pressed.png"); // adjust filename as needed
    boolean spaceDown;
 
    public Circle()
    {
        setImage(upImage);
    }
 
    public void act()
    {
        if (spaceDown != Greenfoot.isKeyDown("space")) // was there a change in state of key
        {
            spaceDown = !spaceDown; // save new state
            if (spaceDown) // is down the new state
            {
                setImage(pressed.png);
                ((Game)getWorld()).bumpScore(); // pseudo-code to have world increment score counter; adjust as needed
            }
            else setImage(unpressed.png);
        }
    }
}

((Game)getWorld()).bumpScore(); // pseudo-code to have world increment score counter; adjust as needed

if (getWorld() instanceof World_30) ((World_30)getWorld()).bumpScore();
else if (getWorld() instanceof World_60) ((World_60)getWorld()).bumpScore();
else ((World_90)getWorld()).bumpScore();