WarioWare: D.I.Y. Showcase is a WiiWare game, the first WarioWare title for the format. It is designed as a showcase for all the WarioWare: D.I.Y. products, such as microgames, music and comics. The game features connectivity with the Nintendo DS game WarioWare: D.I.Y. Microgames come pre-loaded on this game, but additional games can be obtained from the DS, other Wii consoles, or from Nintendo via Nintendo WFC. The player can also send microgames to others from Wii to Wii, or from Wii to DS.
Microgames are organized by character: Wario-Man, Dribble & Spitz, Kat & Ana, and 18-Volt. Wario-Man microgames feature Wario himself, Dribble and Spitz microgames involve science fiction, Kat and Ana microgames involve animals, and 18-Volt microgames feature Nintendo products. After all microgames are accounted for, Shuffle Stages are unlocked. These stages feature all the microgames in the game. Upon completing five microgames, the speed gets higher.