Yeah, it's really just meant as a demo, not a full game. The nice thing about is it properly calculates the angle that a ball would bounce if it hits a brick, even if it hits the corner. But, it's more here so that others can borrow the code if they want. I don't really have time to make it into a full game.

Ok, it's fixed! You may need to clear your Java file cache (http://www.java.com/en/download/help/plugin_cache.xml) before it works here on the gallery. And of course the problem will be present in exported scenarios, until the next Greenfoot release.

Awesome - I've been waiting for more content for ages. It's really developing quite well. I do seem to have got stuck in chapter 2 - connected three wires, but the door is still locked. Is there more, or is that the end so far?