From the Super Mario Wiki
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Block Party is Young Cricket’s Boss Microgame in WarioWare: Smooth Moves. The name may be a pun on Block Party (or Bloc Party), which can mean several things. The minigame Block Star is an extended version of this microgame.
The player will be holding a platform on the palm of a hand. Blocks of various shapes will be falling down, and the player has to move the hand with the remote to catch them and balance them. It has to sustain itself for three seconds.