This is oddly fascinating. I know it says at the top that it doesn't really change, but I had to stare for a while just to make sure...

Oh, one more thing: When I'm on my laptop, the world does not fit on my screen. Making the world a little less high would work better for laptops and other people with smaller screens.

Wow - this looks good! I had two situations when it crashed (once when I went into the tutorial-basics section, and when I first entered fighting mode), but both times I could just click Run again and it continued. Worked very well otherwise. Lots of work has obviously gone into this already - great stuff!

It's a start. It would probably feel more interesting if you made it a bit quicker (using the speed slider). Regarding adding asteroids: Have a look in your Space class. There is code where the rocket gets added. You need very similar code to create and add the asteroids. For example: Asteroid asteroid1 = new Asteroid(); and then you add it in a similar way to adding the rocket.

The addition of the time limit is good. The hard level isn't very hard, though. Maybe the cars could be faster in this level (instead of more cars). Or you should have less time.

Nice, solid implementation of an old classic. I might like the side move to be a little quicker (and maybe the down arrow to rotate the other way instead of dropping), but otherwise it's very nice. Good work.

Hi Reag, There's a problem with the background image of your 'TestWorld'. Most likely the spelling in the 'setBackground' call in the TestWorld constructor uses different capitalisation than the file name on disk.