This is fun:

http://www.planarity.net/

I managed to get up to level four without too much difficulty.

 

Edit: woo! Level six.

Level 7 was the first to take some time. But now I got to goto lab. :/

 

It's not too difficult actually if you just make lots of little shapes. I like it but it gets annoying how you have a limmited space to work in. It's hard squeezing those fat circles in sometimes.

Okay I've figured it out. It's pretty easy now. just zoomed through 9 and 10.

 

btw after 10 when the circles touch they just start overlapping at the start. I've got to run away.

Phew finally managed level 10. According to the FAQs, Bluenoise, we should be considering ourselves in select company