I saw you doing this in your code: [code]World world; world = getWorld(); world.dosomething;[/code] This could be better by doing this: [code]getWorld().dosomething;[/code] This uses less memory, because we're not creating variables that have to be stored in your memory. It wouldn't be that much code that you use less when you do it on my way, but it's always better to don'use more memory than you need to. I hope this helps.

Tip: use the new Highscore APIs in Greenfoot 2.2. I wrote a course about upgrading your skills to Greenfoot 2.2, you can download it here: http://www.2shared.com/document/fK0wPwlQ/Learning_Greenfoot_22.html This comes in handy when you want to take full advantace of the new Greenfoot 2.2 features

but the bosses skin will deteriate as it loses health but im having a bit of trouble changing the skin ps i spent half an hour making hte skins lol :{)