Enter the below codes at the "Password" screen.

Effect	Password
Back Mode level 01	MHRI
Back Mode level 02	JTZX
Back Mode level 03	GKXK
Back Mode level 04	IXDD
Back Mode level 05	IDQY
Back Mode level 06	HCZG
Back Mode level 07	FCNW
Back Mode level 08	XGPX
Back Mode level 09	RCNV
Back Mode level 10	WTPO
Back Mode level 11	ZZBJ
Back Mode level 12	SCRI
Back Mode level 13	DJGN
Back Mode level 14	AZAC
Back Mode level 15	GOKF
Back Mode level 16	LDFK
Back Mode level 17	AMLE
Back Mode level 18	DKYB
Back Mode level 19	JARO
Back Mode level 20	CCEF
Hard Mode level 01	ODPA
Hard Mode level 02	YFVQ
Hard Mode level 03	STOO
Hard Mode level 04	EIWV
Hard Mode level 05	PYZZ
Hard Mode level 06	TNHS
Hard Mode level 07	HQME
Hard Mode level 08	OJUK
Hard Mode level 09	QDDI
Hard Mode level 10	XRQS
Hard Mode level 11	RRSZ
Hard Mode level 12	KOJZ
Hard Mode level 13	AYLG
Hard Mode level 14	OMQS
Hard Mode level 15	PULA
Hard Mode level 16	VSZL
Hard Mode level 17	JYQO
Hard Mode level 18	SFIX
Hard Mode level 19	BYPC
Hard Mode level 20	WSRY
Normal Mode level 01	LPRP
Normal Mode level 02	OSCK
Normal Mode level 03	ORMM
Normal Mode level 04	OIWG
Normal Mode level 05	EKSE
Normal Mode level 06	NQQR
Normal Mode level 07	UGLK
Normal Mode level 08	JPPH
Normal Mode level 09	EUHI
Normal Mode level 10	KGKB
Normal Mode level 11	MZAK
Normal Mode level 12	BBGZ
Normal Mode level 13	JKFF
Normal Mode level 14	FGTX
Normal Mode level 15	XTLN
Normal Mode level 16	ADLM
Normal Mode level 17	PGCS
Normal Mode level 18	QXWB
Normal Mode level 19	ONQU
Normal Mode level 20	GFGI
Practice Mode level 1	AAIA
Practice Mode level 2	JFNF
Practice Mode level 3	SYHL
Practice Mode level 4	CSOB
Practice Mode level 5	EVRT
Practice Mode level 6	VYFL
Practice Mode level 7	YVYV
Practice Mode level 8	MANU