This is a little gem of a trick which will prevent you from losing your Skill level in a game of Tennis, Boxing or Baseball you've just lost. What you have to do is just as you lose the game press the 'Home' button before the 'You Lose' display appears on the screen and then exit the Wii menu. If your timing was correct your Skill level in that sport will not have decreased when you reenter it.

When you are playing the Tennis 'Target Practice' game if you don't hit the target you will hit the brick wall around it making the part of the wall you hit go a slightly darker colour. When the bricks get dark enough they will create a hole in the wall and if the ball goes therough the hole the training session ends.

When you have defeated the Grand Champion (Matt) in a boxing match you'll be able to unlock the silver boxing gloves by holding '1' when the screen becomes black before a boxing match.

Press and hold 2 at the warning screen that shows after selecting characters.