Hi there. Maybe it's my first post in English (because i'm hoping that this post will be indexed by google robot.. hehe)
Well just straight ahead, i'll give you some hints in finding the Basic Level X Codes at HackThis!! that i had found last holiday.
However, i hope that you find this post useful after you've been stuck for a day, week, or maybe a year :D
(in other word, please TRY to figure it out by yourself FIRST, then look at hints on forum/internet or this post)
Here you go (hope that i still remembered :D)