You can say that The Chase, Idiotest and Skin Wars should be guaranteed renewal based on ratings, but now it is a guarantee that The Chase, Idiotest and Skin Wars will all receive additional seasons by the end of the summer.
In other words, The Chase, Idiotest and Skin Wars have all been (unofficially) renewed by GSN.
The Chase will be getting a fifth season. Idiotest and Skin Wars will each be getting third seasons. While the renewal is known, the number of episodes are not.
In addition, on GSN's casting page for future shows, The Chase, Idiotest, Skin Wars and upcoming GSN series Hellevator are active on the casting page.
Through all this, the higher-ups at Game Show Network have confidence in these current three GSN originals. However, there is no mention of Steampunk'd or Chain Reaction (which have not been tested on the air yet).