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Thanks I'll implement it to see if it works

I would appreciate

Should be:

At end of act method (or after all movement has been completed), test the paddle's location. If the paddle is within half its image's width from an edge, reset its location so that it is AT half its image's width from the edge.

The error occurs because getObjects(Shit.class) returns a List object, not a specific Actor object, and getX() and getY() are only declared in the Actor class as instance methods. That is, you cannot use those methods on a List instance. You must first make sure that the list is not empty. Then, if not, extract a ship from the list and use the methods on it.

Also, line 3, within a for loop, is troublesome because you a scaling the same image multiple times, which never works well. Best is to save the original image in an instance field, and on each iteration of the loop, create a copy of that image and then scale the copy once.

Show all methods and fields that deal with the coin counter and indicate the classes each code block/field is in.

One way is to add lines to the road. A center line whose dashes moves down would make the road appear to be moving downward (or passing under a vehicle, facing upward, that is stationary but appearing to move forward). To make it more realistic, you can save the image of one segment of the line and copy/scale in proportion to the y-coordinate value. The speed of the line can also be made to be in proportion to the y-coordinate value to give some depth to what is being viewed (this would most probably require the y-coordinate value be saved and used in more precise than pixel units).

Please have a look at https://www.greenfoot.org/topics/64967/0 There is a menu to choose which ship the hero is flying. You can reuse it for your idea, especially adding buttons for each position to the chooser-menu. At the button action, you can also add a check whether the hero has enough coins and the reduction of coins when the number of coins is sufficient. You can also add booleans to the hero class to indicate whether the effects are already bought. Please let me know whether this helps, otherwise just add additional questions as response here to resolve any remaining problems.

The problem is probably the check "x>=0 ||x==getWorld().getWidth()". The first part checks whether x is greater or equal 0, which is always true. But I think you want to check whether x is less or equal. Note, that you need two simple ideas as the basis for the reflecting: 1. If the fish bounces off top or bottom, its new rotation is 360-oldValue. 2. If the fish bounces off left or right, its new rotation is 180-oldValue. A simple source code to implement this:

ok, but, could you send me a code, as an example, if you can

Use Actor type objects to display clickable text. Use World objects for different screens (probably).

Need codes for Robby2 constructor and for randonSpawn method.

It seems that "this.paddle" is null. Therefore: 1. Please give the source code where the constructor is called (new Ball(..., ...)). (if the first parameter is null, we found the problem) 2. Please change the line "public Paddle paddle;" to "private final Paddle paddle;". This ensures that the constructor is the only place "this.paddle" is set (otherwise one would have to check whether paddle gets changed somewhere else in the source code).

Never mind, I figured it out.