Alternate paddle in Laser Hockey:
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Before the timer starts, press A + B to use a different circular paddle.

Platinum medals:
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Successfully complete the indicated task to get a platinum medal in the
corresponding event:

Billiards: Earn at least 63 points
Charge: Get a score of 325 points
Find Mii: Reach the 100th stage
Fishing: Score over 2,500 points
Laser Hockey: Score at least 16 goals and win the match
Pose Mii: Earn over 1,000 points
Shooting Mange: Earn over 600 points
Table Tennis: Return the ball over 200 times without missing
Tanks: Successfully complete the first 20 levels to get the Gold medal, then
play through the game again, which now has 100 levels

Screen saver:
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Allow the game to idle at the Game menu. Your Mii will fall asleep and new music
will play. Your Mii will eventually wake up and the music will return to normal.
Finding the different Mii in Find Mii
In the Find Mii mini-game, every time you are asked to find the different Mii or
Miis, start to pointing at every Mii. If at any moment you are pointing to a Mii
but instead the Mii in front of that one stands up (or the one at the back,
etc.), that one is the different one (the Mii that stands up without pointing it
out).