WarioWare: Smooth Moves Cheats

Get to Level 30 on Thriller and you can unlock Sound test. You can either listen to the songs or conduct the orchestra like the minigame.
I didn't think anyone knew this so I hope it helped!

Complete the following tasks to unlock the corresponding effect.
Unlock Movie Theatre Mode:
Play Wario's stage.
Unlock Multiplayer Mode:
Complete the Single-Player game.
Unlock Temple Of Form:
Play at least one Microgame.
Unlock Sound Studio:
Complete at least 20 games in succession on Trilling mode.

Multiplayer Modes
Beat Tiny Wario's stage in Single-Player then go to the Main Menu and select Multi.
Unlock Darts:
Unlock Multiplayer (Beat Tiny Wario's Stage).
Unlock Survival:
Unlock Multiplayer (Beat Tiny Wario's Stage).
Unlock Star Nose:
Play a game of Darts.
Unlock Balloon:
Play a game of Lifeline.
Unlock Lifeline:
Play a game of Bomb.
Unlock Bomb:
Play a game of Survival.
Unlock Bungee Buddies:
Play a game of Star Nose.

Unlock Mini-Games
Unlock the 6 mini-games by completing the corresponding tasks. When they are unlocked they will appear on the left side of the map screen.
Unlock Can Shooter:
Complete Ashley's Microgames.
Unlock Tortoise and Hare:
Complete Orbulon's Microgames.
Unlock Tower Tennis:
Complete Kat and Ana's Microgames.
Unlock Balloon Trip:
Complete Dr Crygor's workout stage.
Unlock Block Star:
Complete Young Cricket's Microgames.
Unlock Pyoro S:
Play ALL the Microgames from every character.

While playing the minigame "tower tennis" hold your wii controler upside down. This will let you hit the ball woth much more pwer achiving double the amount of hight compared to holding your controler in the normal fashion.

At the title screen there are several fun little “games” you can play.
-If you hold the remote with the pointer facing the ceiling and tilt it side to side, the Remote on the screen will move across a set track, changing the color of it's path and the little sketches/characters in the background.
-If you hold the Remote forward (pointing at the screen), and move it up and down, the title will jump around the screen/vibrate/ect.
-If your pointer is showing up on screen, Wario’s eyes (bottom left) will follow your pointer around.
-You can also use the pointer to pull/flick his mustache.

While playing block star minigame mode, for every ten levels you complete, you unlock ten more. There is 50 levels total.

Once unlocked, these minigames will appear on the left side of the map screen.
Minigame ---------- How to unlock
Can Shooter ------- Complete Ashley's Microgames
Balloon Trip ------ Complete Dr Crygor's workout stage
Tower Tennis ------ Complete Kat & Ana's Microgames
Tortoise & Hare --- Complete Orbulon's Microgames
Block Star -------- Complete Young Cricket's Microgames
Pyoro S ----------- Play every microgame from every character

Different gameplay modes that can be unlocked throughout the game.
Mode ----------------- How to Unlock
Movie Theatre mode --- Play Wario's stage. Multiplayer Mode ----- Complete the Single-player game. Sound Studio --------- Complete at least 20 games in succession on Trilling mode. Temple Of Form ------- Play at least one Microgame.

These buildings can be unlocked in a chain after finishing the story mode.
Building ---------------------------------- How to Unlock
All Mixed Up Building (random microgames)-- Beat the last stage (Tiny Wario)
Sudden Death Building (one life) ---------- Get 20 or more points on the Super Hard Building.
Super Hard Building (very fast) ----------- Get 30 or more points on the Mixed Up Building.
Thrilling (no Form cards) ----------------- Get 10 or more points on the Sudden Death Building.