Momma Mia! that's alot of work!!!
I already find it hard to beat the game in normal... But thanks for the info. I was a bit confused about what to do

A friend of mine swears he unlocked Noob the same way.... unlocking everything, but then he beat it with Reptile on Very Hard, then it unlocked him. I'm still not convinced about the "Smoke Scorpion or Reaper Scorpion thing......

Believe me, that's how I did it. It might not have to be in that order, but it's been confirmed by numerous people and sites that this is indeed the way to unlock him.