Level codes (working in v1.12):

 GSHS6S   - 02
 JSJDF7   - 03
 V0VANZ   - 04
 KWHH2J   - 05
 MLKSAL   - 06
 KDMWQS   - 07
 KAHDND   - 08
 ZXKA62   - 09
 JMNCH6   - 10
 PODSHJ   - 11
 VETER1   - 12
 FJD6HH   - 13
 MONST6   - 14
 HSPOQ1   - 15
 GERGW4   - 16
 NBC721   - 17
 GRIGR1   - 18
 HELLO0   - 19
 JSYUYD   - 20
 LJNSJ2   - 21
 JSS733   - 22
 DH32HS   - 23
 324BNC   - 24
 JSNHDU   - 25
 NCVKDW   - 26
 QUWEYH   - 27
 2HBVD3   - 28
 JKD3KL   - 29
 KFJHFN   - 30
 JJF2H7   - 31
 MAP1AT   - 32
 LOUW23   - 33
 NCBDE3   - 34
 POIENM   - 35
 DUPLK3   - 36
 CJDD3S   - 37
 SERP76   - 38
 THEEND   - 39