First off, Saunavihta Vortex is pretty creepy. I mean, it's not really kid-friendly. But having said that, it's can be lots of fun for teens and adults.
Basically, you control the fate of a ragdoll. You need to somehow get the ragdoll into a flaming pit. When the ragdoll gets there and stays there for three seconds, you pass the level.
To get the doll there, you need to launch, batter and roll it across the level in all sorts of creative ways. The level is composed of contraptions built of white and black bars. The white bars disappear when you click them. So if you have a "swing" that stays put thanks to a delicate balance between a white bar and a black bar, as soon as the white bar goes, that swing is going to move.
You can zoom out using SPACE to see more of the level; by default, you're zoomed in quite close. The closer zoom level is useful for getting the timing right when it's important, and zooming out helps you figure out the general direction.
A beautiful game with a unique atmosphere.