You know him. You love him. That wily trickster, Wario, is taking over the Nintendo eShop today as WarioWare Gold gets a cracking demo which you can play right now. Seriously, go download it.
While the intensity of Wario's video game tournament is the main draw, there are other modes you can dabble in to help you better your skills. At some point you'll definitely want to have a go in the Arcade or Challenge modes.
This is a great time to test out the game before committing to it on 3DS. If you dig it, you've only got to wait until next week when the full game comes out on July 27th.