Don't know if I'll have time (or the skills) to finish Level 8 (it looks pretty intense), but the other levels were a lot of fun. This was done really well - thanks for doing it!
Level 7 is actually harder technically than Level 8, although Level 8 had problems at their end when there were too many people trying for it, overloading the Level 2 and Level 8 servers and making it hard to get a successful exploit. Once they fixed that, it was easy.