Teenage Mutant Ninja Turtles Double Pack Cheats - GBA

Teenage Mutant Ninja Turtles: Unlock Very Hard Mode
At the title screen enter in the following button combination to unlock Very hard mode.

[Up], [Up], [Down], [Down], [Left], [Right], [Left], [Right], [B], [A]

Teenage Mutant Ninja Turtles 2: Battle Nexus: Extra Race & Battle Level Passwords
For the passwords below,

L = Leonardo
M = Michaelangelo
D = Donatello
R = Raphael
S = Splinter

DDRSMSR - Course 16 in battle mode
RDLDSMD - Course 16 in race mode
SMRDLML - Course 17 in battle mode
MDSMSDM - Course 17 in race mode
LMSLSRS - Course 18 in battle mode
SRMLDDR - Course 18 in race mode

Teenage Mutant Ninja Turtles: Bonus Level Passwords
For the passwords below,

L = Leonardo
M = Michaelangelo
D = Donatello
R = Raphael
S = Splinter

LSMMS - Bonus Level 1
SSLDM - Bonus Level 2
MSSLD - Bonus Level 3
SRLMD - Bonus Level 4
LSDRM - Bonus Level 5

Teenage Mutant Ninja Turtles: Passwords
For the passwords below,

L = Leonardo
M = Michaelangelo
D = Donatello
R = Raphael
S = Splinter

LSDRM - Alternate Donatello costume (hold L or R at character select scene)
RSLMD - Alternate Leonardo costume (hold L or R at character select scene)
RLSLS - Alternate Michaelangelo costume (hold L or R at character select scene)
SLSMM - Alternate Raphael costume (hold L or R at character select scene)
DDDML - Alternate sound effects
SRLMD - Casey Jones mode
DRLDS - Donatello gains attacking power
MLMLS - Donatello has double defense
MLSDS - Donatello has double power-up effects
LMLSD - Leonardo gains attacking power
LDSMS - Leonardo has double defense
RSDMM - Leonardo has double power-up effects
SSLDM - Leonardo has unlimited fire shurikens and pizza always appears
MSRMM - Michaelangelo gains attacking power
RLDDR - Michaelangelo has double defense
RLMSM - Michaelangelo has double power-up effect
MSSLD - Michaelangelo has unlimited fire shurikens and pizza always appears
LSDRM - Playmates toy database
RDSRL - Raphael gains attacking power
SDRML - Raphael has double defense
RSSSR - Raphael has double power-up effects
LSLML - Splinter mode

Teenage Mutant Ninja Turtles: Shredder's Tower level
Complete all levels on Normal mode to unlock Shredder's Tower secret level.