Here's my guide for lvl. Just use Commando Class with First blood or OICW as primary, ammo feed, and bouncing betty. Try capturing 3 flags at the begining, this will give you an advantage. Then you just need to have 2 Flags. A and B Or B and C. Use your bouncing betty to cover a flag while you capture another one. This worked for me.
I had finished my cat eye... I didn't see and for mistake I pressed ERASE ALL... 3 and a half hours ... THERE SHOULD BE A BOTTON TO RECOVER YOUR DRAWING ):