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Recompiling after code change does work: that's not the problem. The problem is that after all classes have been compiled after editing code, it is not possible to run the application from the main Greenfoot window: "Execute", "Pause" and "Reset" buttons are grayed (disabled) I've found a workaround: apprently Greenfoot configuration files that Greenfoot creates at first execution and modifies after configuration changes were corrupted. I had a 'greenfoot' folder into my personal folder, with files regularly updated by Greenfoot. I've deleted it and apprently everything works fine again no

That would be great

The return command is used to cause an immediate break out of the method and "return" back to the method that called it. Once executed, no proceeding lines of code in that method are processed. In a void method, nothing will (or can) be returned. In a non-void method, only a value matching the return type will (or can) be returned. It is a control-flow type command similar to the break command (when void of a return type), which causes an immedi

Thank you very much danpost, this is what I will do!

Alright that worked, thank you!

Show enter screen codes.

In this case, you can use: <Code Omitted>

That is because dialog1 was never in the world. Again, you have "new Dialog1()" in your code more than once.

Thank you, I solved it by creating transparent pixels there and when intersecting, it moves back off it.

It is probably having each tube, both top and bottom, adding to the score. It would be okay to just allow it, internally. You can display half that value in the score display actor.

You have to place the sound file in the "sounds" folder of your project. If the file is called "a.wav", then you use "a.wav" and not the full path or anything complicated.

Thanks! it worked, you saved my grade.

Have the world respawn the object (only remove it when hitting a border).

I wrote:

Save the starting coordinates and move from there as you move farther each iteration of the loop. Use Greenfoot.delay(1); within the loop to show the animation: <Code Omitted>I think I did that right so you can adjust the speed easily. This would replace lines 16 thru 18.