There is something that I don't understand about this puzzle...
If it is based on the noob cipher than for each message there should be only one solution as it is said that each line is encrypted with a different substitution table.
In order to get
WELCOME TO CODER CHARTS
WELCOME TO COVER CHARTS
from HQVMZDQ PZ MZLQE MSIEPJ
one would need 2 keys... or am I wrong.. may be I am missing something obvious, but I will be grateful for any hints/explanations...