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The greenfoot.Greenfoot class has the methods you will need both for checking on click on an actor and for changing worlds. Check out the documentation on the class.

Remove all from lines 7 to line 24 except for line 23.

Thanks

With speed 50 (speed slider in the middle), one second is about 55 act cycles, so you could count it as it is and when displaying, you divide it by 55. And stopping at 0 makes sense if you don't want a negative time. You could stop the scenario at 0 or do whatever should be done when the time is over.

my world class

Line 18 alone removes all objects from the world.

Alright. Thanks a lot :)

The mouseDragged method requires an object, not a class. So for a start, replace 'Pet.class' with 'this'.

You can have a variable used as a timer in your world. <Code Omitted>

Do you change the image in your act method? Or in other words, if you don't start the scenario and add a Puppy with right click on the class, is the image huge or 20x20? Are you sure it is compiled? Sometimes, when the auto-compile doesn't work anymore, you have to restart Greenfoot.

<Code Omitted> True, but it is quite complicated to remove the object and re-add it instead of simply change its location.

I do not see where 'c' is declared as a variable. Also, I do not see where 'd' is used anywhere (although it might be used elsewhere).

Well, you need to create a subclass of World for the game over screen; also, you will need to add the final score text to that world (either onto the background or by use of an actor). Easiest way to accomplish that is to break line 3 above into the following: <Code Omitted>so you can add the a

Thanks for the reply, but i think in order for that to work, i need to be able to turn RoundRectangle2d.Float into arrays of x and y coördinates. The RoundRectangle2D.Float class doesn't have this. I have however found a way to fill it in though. All i needed to do was add ovals to the 4 corners and add two squares in a cross pattern.

Apparently it doesn't find an image with the name 'title.png' (line 1 in the terminal window). Make sure an image with exactly that name exists in the image folder of your project.