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Add an actor to act as a door or gateway. It can have an image or be transparent. It can have a reference field to hold the world it leads to and check for the actor to contact it and change to that world. Its class code could be like this:

Line 1 creates the Bullet object and stores it in an object reference variable 'bullet' which is declared to hold an object of type 'Bullet'. Line 2 adds the bullet into the world at the location of the tank. Line 3 sets the rotation of the bullet to that of the tank. I could have spent lines of code on it like this:

What does it say about line 37 (hover over it?)

Works brilliantly! Thank you very much. I'm sure I'll be back with more questions. Thanks for a swift response too!

thank you!

I will presume that your levels are in different World subclasses. If so, then use the Greenfoot class method 'setWorld': <Code Omitted>

Just add additional if statements in the 'isTouching(Door.class)' block.

How to create a button with text is explained in my Value Display Tutorial.

An inventory is just a list of items. Java already has an extensive supply of classes that create all kinds of lists. However, you might want some extra methods that are not readily available (like getting the number of objects of a specific type in the list; or, getting one or all objects of a specific type from the list). It would make sense then to create a subclass of the ArrayList class to add those methods that deal with Class types. Something like this:

Okay. Have world create and maintain the list adding when created and added to world and removing any that are removed from the world. Then, have the tower determine the first in the list from what are in range:

Show what code you tried when you got that error message.

Line 10 needs a condition: <Code Omitted>