Sima is a rare liquid material. Submerging yourself in it gives you the Wet effect - however, it does not behave like water, i.e. it does not turn toxic sludge into water, does not react with lava, and cannot be frozen. Consumption will give you the Mildly Boozed effect for a maximum of one second. It reacts with Strange Brickwork to create small amounts of Teleportatium and slightly more smoke in comparison.
It may have a chance to spawn in regular play.
Kiuaskivi does not destroy the liquid when submerged
On April 30 and May 1 (holiday of Vappu), Sima has 20% chance spawning in every potion.