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NES Cheats: Teenage Mutant Ninja Turtles 3 : The Manhattan Project Cheats

Save energy:
Repeatedly press A + B when low on energy to keep it from going down faster.

Auto turtle selection:
Press Down(5) at the character selection screen, or Down(10) at the same screen for two player mode. After a turtle is defeated, the next turtle will automatically be selected randomly. Alternately, rapidly tap Left, Right repeatedly at the character selection screen.

Cheat mode:
Press Up(2), Down(2), Left, Right, Left, Right, A, B, Start at the title screen before the demonstration starts. Note: For two player mode press Up(2), Down(2), Left, Right, Left, Right, A, B, Select, Start. Level select, extra lives, and sound test options will now be available.