Type in

 BILLANDTED

 as level code and you can press [5] on the numeric pad to end the level
 successfully.


 Levelcodes:

 Lvl    FUN        TRICKY      TAXING      MAYHEM
 --------------------------------------------------
 01  ----------  HBANLMFPDV  MFIBAJLNFS  NHMFHFALHV
 02  IJJLDNCCCN  BINCMFHQDO  FIBIJLMOFL  HMFHFINMHO
 03  OHNLHCADCN  BAJHLDIBEO  IBANLMFPFY  MFHFAJLNHX
 04  HNLHCIOECW  IJHLDIBCEX  BINLMFIQFR  FHFIJLMOHQ
 05  LDLCAJNFCK  NHLDIBADEU  FAJHLDHBGT  HFANLMFPHN
 06  DLCIJNLGCT  HLDIBINEEN  IJHLDHFCGM  FINLMFHQHW
 07  HCANNNLHCW  LDIBAJLFEW  NHLDHFADGJ  FAJHLDIBIW
 08  CINNLDLICJ  DIBIJLLGEP  HLDHFINEGS  IJHLDIFCIP
 09  CEKHMDLJCO  IBANLLDHEM  LDHFAJLFGL  NHLDIFADIM
 10  MKHMDLCKCX  BINLLDIIEV  DHFIJLLGGV  HLDIFINEIV
 11  NHMLHCALCT  BAJHMDIJEX  HFANLLDHGR  LDIFAJLFIO
 12  HMDLCIOMCJ  IJHMDIBKEQ  FINLLDHIGK  DIFIJLLGIX
 13  MDLCAKLNCS  NHMDIBALEN  FAJHMDHJGM  IFANLLDHIM
 14  LHCIKLOOCR  HMDIBINMEW  IJHMDHFKGV  FINLLDIIIN
 15  HCEONOLPCU  MDIBAJLNEP  NHMDHFALGS  FAJHMDIJIP
 16  CMOLMDLQCV  DIBIJLMOEY  HMDHFINMGL  IJHMDIFKIY
 17  CAJHLFLBOT  IBANLMDPEV  MDHFAJLNGV  NHMDIFALIV
 18  IJHLNHBCOP  BINLMDIQEO  DHFIJLMOGN  HMDIFINMIO
 19  OHLFHBADDV  BAJHLFIBFR  HFANLMDPGK  MDIFAJLNIX
 20  JLNACIOEDJ  IJHLFIBCFK  FINLMDHQGT  DIFIJLMOIQ
 21  NNHCAKLFDS  NHLFIBADFX  FAJHLFHBHW  IFANLMDPIN
 22  NHCMJLNGDO  HLFIBINEFQ  IJHLFHFCHP  FINLMDIQIW
 23  HCAOLLNHDW  LFIBAJLFFJ  NHLFHFADHM  FAJHLFIBJJ
 24  BINLLFHIDV  FIBIJLLGFS  HLFHFINEHV  IJHLFIFCJS
 25  BAJHMFHJDX  IBANLLFHFP  LFHFAJLFHO  NHLFIFADJP
 26  IJHMFLCKDV  BINLLFIIFY  FHFIJLLGHX  HLFIFINEJY
 27  NHMFHBALON  BAJHMFIJFK  HFANLLFHHV  LFIFAJLFJR
 28  HMNHCINMDP  IJHMFIBKFT  FINLLFHIHN  FIFIJLLGJK
 29  MFHBAJLNDP  NHMFIBALFQ  FAJHMFHJHP  IFANLLFHJX
 30  FHBIJLMODY  HMFIBINMFJ  IJHMFHFKHY  FINLLFIIJQ