There are mazes, and you have to navigate them with your mouse — without it being visible. The pointer disappears and you just have to project where you think it is. I think it’s way, way more diffcult than the little reversed-mouse thingamajig.
(Warning: Some of the other content on the site may be questionable. And some of it is just freaky, like this guy breaking his leg in a kickboxing match. Jeepers.)