I don't know anything about Mr Gimmick, so these are probably not all the codes? But, this game was particularly easy to generate Game Genie codes...(PAL version)
OXOAPPSX + ENOALPEI + (these 2 codes, plus one of the following)
PEOAZPIA =01
ZEOAZPIA =02
LEOAZPIA =03
GEOAZPIA =04
IEOAZPIA =05
TEOAZPIA =06 credits
YEOAZPIA =07 intro cut scene
The level seems to be RAM address $1b, and these codes seem to change the starting level at reset.
Comments
OXOAPPSX + ENOALPEI + (these 2 codes, plus one of the following)
PEOAZPIA =01
ZEOAZPIA =02
LEOAZPIA =03
GEOAZPIA =04
IEOAZPIA =05
TEOAZPIA =06 credits
YEOAZPIA =07 intro cut scene
The level seems to be RAM address $1b, and these codes seem to change the starting level at reset.
IEOAZPIA actually starts you at level 6, TEOAZPIA just shows the bad ending cut scenes, and YEOAZPIA is the good ending cutscenes/credits.
Many thanks for the help, dougeff!!