Gives turtles squeaky feet: At the title screen, press: Up, Up, Down, Down. Left, Right, Left, Right, X, O

Alternate Costumes:

• Donatello's alternate costume: DDSMS
• Leonardo's alternate costume: LDMSR
• Michelangelo's alternate costume: RRLMD
• Raphael's alternate costume DMDML

Gembu Turtle Power: Beat ''Special Stage: Ordeal'' with each Turtle

Hidden Characters:

• Casey Jones: Complete Stage 1 as Raphael - (Stage 1, Area 2)
• Casey Jones in Story Mode: Beat Challenge Mode at any difficulty in under 15 minutes
• Evil Turtlebot: Complete Stage 3 as any of the Turtles - (Stage 3, Area 5)
• Hun: Complete Stage 6 as Michelangelo - (Stage 6, Area 6)
• Oroku Saki: Defeat Oroku Saki as any of the Turtles - (Stage 6, Area 8)
• Oroku Saki fight: Beat game with all 4 turtles
• Shredder: Defeat Shredder as any of the Turtles - (Stage 6, Area 7)
• Splinter: Complete Dojo Stage 3 as Leonardo - (Dojo Stage 3)
• Yoshi Hamato: Complete the Challenge mode as any of the Turtles - (Challenge mode boss)

To unlock Master Splinter in Story Mode, enter MSRLS in the password screen.

If you play on Halloween (October 31), your character will have a pumpkin head. Playing on Christmas Eve/Christmas (December 24, 25) will outfit your character with a Santa costume. You can adjust your PlayStation 2 console's clock and date settings to October 31th or December 24th or 25th instead of waiting for those dates to come up.

Cheat Codes (GameCube)

Passwords:

• Alt Donnie Costume: RRSLR
• Alt Leo Costume: RSLMD
• Alt Mikey Costume: RLSLS
• Alt Raph Costume: SLSMM
• Alt Sound Effects: DDDML
• Bonus Course 1: LSMMS
• Bonus Course 2: SSLDM
• Bonus Course 3: MSSLD
• Bonus Course 4: SRLMD
• Bonus Course 5: LSDRM
• Casey Jones Mode: SRLMD
• Donnie gains attack power: DRLDS
• Donnie: longer bandana/ 2x power up effect: MLSDS
• Donnie: shorter bandana/ 2x defense: MLMLS
• Improved weapon for Leonardo: LMLSD
• Improved Weapon for Michelangelo: MSRMM
• Improved weapon for Raphael: RDSRL
• Leo: Infinite Shuriken: SSLDM
• Leo: longer bandana/ 2x power up effect: RSDMM
• Leo: shorter bandana/ 2x defense: LDSMS
• Mikey: longer bandana/ 2x power up effect: RLMSM
• Mikey: Infinite Shuriken: MSSLD
• Mikey: shorter bandana/ 2x defense: RLDDR
• Playmates Toy Database: LSDRM
• Raph: longer bandana/ 2x power up effect: RSSSR
• Raph: shorter bandana/ 2x defense: SDRML
• Splinter Mode: LSLML

Unlockable:

• Challenge Mode: Beat Oroku Saki in story mode
• Character: Casey Jones: Beat Stage 1 as Raph
• Character: Evil Turtlebot: Beat Stage 3 as any turtle
• Character: Hun: Beat Stage 6 as Mikey
• Character: Oroku Saki: Beat Oroku Saki as any turtle
• Character: Shredder: Beat Shredder as any turtle
• Character: Splinter: Beat Dojo Stage as Leo
• Character: Yoshi Hamato: Beat Challenge Mode as any turtle
• Gembu Turtle Power: Beat story mode with all four turtles
• Oroku Saki fight: Beat game with all 4 turtles

Silly walking sounds: If you enter the classic Konami code (Up, Up, Down, Down, Left, Right, Left, Right, B, A) on the title screen, you should hear the Turtles say ''Yeah!'' Now hit start and go to the story mode. Every time your turtle takes a step in one of the stages, a goofy ''boing!'' sound will be heard.

Set your GCN's date to October 31 and the Turtles will all be wearing pumpkins on their heads. A Halloween treat!
Set your GCN's date to December 25 and the Turtles will all be wearing little Santa hats! How cute!

Cheat Codes (Xbox)

Passwords:

• Donatello Alternate Costume: SRSMM
• Donatello Gains Attacking Power: DRLDS
• Donatello's bandana becomes longer, and power-up effects are doubled: SMLLR
• Donatello's bandana becomes shorter and his defense doubles: LLSMR
• Leonardo Alternate Costume: RMMLL
• Leonardo Gains Attacking Power: LMLSD
• Leonardo gains Unlimited Shuriken: MSSRD
• Leonardo's bandana becomes longer, and power-up effects are doubled: SLDDS
• Leonardo's bandana becomes shorter and his defense doubles: MLLSR
• Michelangelo Alternate Costume: DLDSM
• Michelangelo Gain Defensive Power: MSRMM
• Michelangelo gains unlimited fire shuriken, and recovery items are always pizza: MRRSL
• Michelangelo's bandana becomes longer, and power-up effects are doubled: SMRDL
• Michelangelo's bandana becomes shorter and his defense doubles: MRLLD
• Playmates toy Database: LSRDM
• Raphael Gains Attacking Power: RDSRL
• Raphael's bandana becomes longer, and power-up effects are doubled: LRLMS
• Raphael Alternate Costume: LMSDD
• Raphael's bandana becomes shorter and his defense doubles: LSMDR
• Unlocks Splinter: LLMSR

Challenge mode: Beat story mode with all four turtles

Versus Mode Character Unlockable:

• Casey Jones: Beat stage 1 with Raphael
• Evil Turtlebot: Beat stage 3 with any turtle
• Hun: Beat stage 6 with Michelangelo
• Oroku Saki: Beat Saki with any turtle
• Shredder: Beat Shredder with any turtle
• Splinter: Beat Dojo stage 3 with Leonardo
• Yoshi Hamato: Beat Challenge mode with any turtle

Set your game systems to October 31st and your turtle will wear a pumpkin head; or December 24th, 25 and your turtle will wear a Santa hat.

Cheat Codes (PC)

Passwords:

• Alt. costume for Donatello (press special attack on the character select screen): LMSSL
• Alt. Costume for Leonardo (press special attack on the character select screen): MSRLR
• Alt. Costume for Michelangelo (press special attack on the character select screen): MMMSL
• Alt. Costume for Raphael (press special attack on the character select screen): SMLSR
• Alternate sound effects: SLSRS
• Attack up for Donatello: DRLDS
• Attack up for Leonardo: LMLSD
• Attack up for Michelangelo: MSRMM
• Attack up for Raphael: RDSRL
• Defense up for Donatello: LRLDD
• Defense up for Leonardo: SSRSL
• Defense up for Michelangelo: LSSDR
• Defense up for Raphael: DSRRS
• Double power up effects for Donatello: SDDLS
• Double power up effects for Leonardo: LDDRS
• Double power up effects for Michelangelo: LMLMS
• Double power up effects for Raphael: DLDRS
• Playmates Toy Database: LSDRM
• Unlimited Fire Shuriken and all food is pizza for Michelangelo: MDMSL
• Unlimited Shuriken for Leonardo: SRRDM
• Unlocks Master Splinter: LDRSM

Challenge mode: Beat Story mode with all four turtles.

Versus Mode Unlockable:

• Casey Jones: Beat him in Stage 1 in Raphael's story mode
• Evil Turtlebot: Beat him in Stage 3 with any turtle
• Hamato Yoshi: Beat him in Challenge mode with any character
• Hun: Beat him in Stage 6 in Michelangelo's story mode
• Oroku Saki: Beat him in Stage 6 with any turtle
• Shredder: Beat him in Stage 6 with any turtle
• Splinter: Beat him in Dojo Stage 3 in Leonardo's story mode

Cheat Codes (Game Boy Advance)