WarioWare, Inc. is a "company", managed by Wario, that produces microgames. It is a spin-off of the Mario series. WarioWare games have been published for every Nintendo system after 2003, and their style varies from system to system, depending on its features (e.g: for Nintendo DS, the games were based on touching the touch screen and blowing into the microphone). Each game consists of microgames (really tiny and simple games like popping balloons or spinning a coin) that are often crazy (like picking a nose). The games might seem simple, but as the player's level goes up, they become more and more challenging. Despite the fact that he now has his own company, he still goes back and is in Mario games, though, his employees stay in WarioWare, and no one in the Mushroom Kingdom has seen them before, or even his WarioWare look, except in Smash Bros. Brawl
WarioWare also features several new characters, which are featured solely in these games. Most of the characters introduced in WarioWare games are friends of Wario's who develop microgames for his company.