TMNT: Teenage Mutant Ninja Turtles Cheats (Nintendo Wii)

In the Boss fight where you must defeat Shredder, instead of focusing on the many Shredder
clones, try fighting the real Shredder. He just stands still while his clones fight you.
One attack that works well is Don's team move that shocks any enemy near its radius. Get
near him and use it. It will shock the clones and him, and he will not be able to attack.
Change to Raphael (because he fights the hardest) and attack Shredder a few times until he
recovers. Once he recovers, repeat the steps until he is defeated. After this level, the
Foot Clan will appear. Use a similar tactic when a Foot commander calls in more Foot
ninjas as you defeat them. Use the same tactic on him. If you do not, he will overwhelm
you with lots of Foot ninjas.

Once you reach the level where you can use all four turtles at once, you must begin
building a relationship with your brothers. You can do this by using your brother throw,
but take turns who is doing the throw. For example, Leo throws Ralph and vice versa, Don
throws Mike. Successful brother throws will build their relationship, and then you can use
their double team attacks. However, failed throws will make them mad at you, and they will
go away and you must win their trust again. Raphael seems to be the one that you make mad
most often.