this one too `? NewGameButtonBlack.png

Yes, that is in the images folder too. I didn't upload the source code however, just wondering how you know what images should be there? The first thing the player should see is the main menu, which uses 6 different button images and the background image itself. They are all in the images folder but none of them show up.

It acts like you have the following (or something like it) in your World subclass act method: You should probably look for the first part of that in your world subclass and trace what it can do from that.

I do have something similar, yes. I created an Actor class called Buttons where I use the if statement if (Greenfoot.mouseMoved(this)) as well as if (Greenfoot.mousePressed(this)) and if (Greenfoot.mouseClicked(this)) to switch between images. I created sublasses of Buttons with the individual buttons and used super.checkNewGameButtonPress(); to call the method of that name from the Buttons class where the if statements are located. The game runs fine in the greenfoot programme, there's no errors and all the files are in the images folder, it just doesn't seem to upload it to here or let me create a jar file. The jar file looks exactly like it does on here. I have tried re-uploading it a few times and I've had no luck.

the java console output: something is not right with your images Edit: not quite sure, but ur images folder is labeled "Images" and not "images"

erdelf, you solved the problem! I must have at some point renamed the images folder for some reason. I don't recall doing it, but I have been working on the game for some time and had so many versions something could have went wrong which could have been the reason I done this. I renamed the folder 'images' and it now works fine. Thanks for your help!