"WarioWare, known in Japan as Made in Wario (メイド イン ワリオ, Meido in Wario), is a series of games featuring the Nintendo character Wario. The franchise was established in 2003 with the release of Mega Microgame$! for the Game Boy Advance. While the first two games were developed by Nintendo R&D1, subsequent games have been co-developed by Intelligent Systems.
The distinctive feature of all WarioWare games is that they are collections of short, simple games ("microgames") presented in quick succession. Each of these microgames lasts about three to five seconds and must be completed, or else a life will be lost. For example, there is a microgame where the player must zap a spaceship; in another, Wario must collect coins in a Pac-Man-like maze. The numerous microgames are linked together randomly and steadily increase in speed and difficulty as the player progresses."
Source: Wikipedia, "Wario_(series)", available under the CC-BY-SA License.