In this website, I will tell you why "Mario Sports Mix" is one of the best Wii games to play on your Wii (or Wii U because it has backwards compatibility with Wii games).
Features and How to Play
Features: It has 4 sports: Basketball, Dodgeball, Hockey, and Volleyball
There are a lot of Mario characters and even characters from other game series such as Final Fantasy.
Some characters have alternate colors/costumes such as Yoshi, Toad, and Slime.
It has minigames for each sport.
You can play in doubles or triples.
You can play as your Mii.
How to play: Purchase a Wii or Wii U (and a Wii remote in case it doesn't come with your Wii or Wii U).
Purchase Mario Sports Mix and put its disc in the Wii/Wii U.
If you have a Wii U, open the Wii app and then select the disc channel to open the game.