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I did do that. I don't see the problem

GreenfootImage is not an actor, unless your healthbar class extends GreenfootImage, it will not work Try using this: <Code Omitted>

i meant to run the jar file... I doubt that your idea is working...

Thank you very much! ;)

Insert as 2nd line in act: <Code Omitted>

Use: <Code Omitted>

Is it possible the actor is not in the world when this code is executed (that is, getWorld() is returning a null value)?

vvv Does this do what you want vvv? <Code Omitted>

Go to and run the linked scenario. Then, click the Who button to view the class code of the "player".

Ok thank you i will try it

thanks for the help!

Depends on how you create the maze and walls (as well as world cell size and image sizes).

Thank you so much!!!

to save score between worlds you can add parameters in the worlds constructor and change levels by setting a new world object with the new parameters

If the objects hitting the actor are removed when hitting, the all you need is an int hitCounter field (or int health=3). If they remain in the world, it is a bit more involved. Just ask for further assistance.