Kirby and the Amazing Mirror is a game in the Kirby series. It is one of the few games in the Kirby series that doesn't feature King Dedede.
In The Super Smash Bros. Series
Master Hand and Crazy Hand appear as the final bosses in Candy Constellation.
Master Hand also appear three times as a miniboss - in Rainbow Route, Radish Ruins and Candy Constellation.
Trivia
When Kirby "swallows" Master Hand or Crazy Hand, he gains the ability known as Smash. The Smash ability features special moves that Kirby has in the Super Smash Bros series.