These are a few level codes I have come across.
VR ZONE:
A2=sxsxtx A3=tssoot A4=tsttot A5=stttxt
INDUSTRIAL ZONE:
A1=tsooxs A2=xsssot A3=tsxstt A4=stsxtx A5=ttosxs
MILITARY ZONE:
A1=ttxtos A2=osttto A3=tsoxts A4=ttxssx A5=oxtttt
A1=osooos A2=tttots A3=sosxst A4=xxsxto A5=xsxtts
s=Square t=Triangle o=Circle x=X