The recently opened YoYo Games is basically an online game database where users can make their OWN VIDEO GAMES using a program called GameMaker. Users then upload their game to the site, and those wanting to play can either download it, or play live from the browser*, using “Instant Play”. A lot of the games are very high in detail, in 3D, and are very fun to play.
Although “Instant Play” isn’t at this time compatible with Firefox 3.0, there is a work around: Download Firefox Add-On “Nightly Test Tools”, then install the YoYo Games add-on.

