Stack rocks, humans, metal, and floors - but be mindful of the weight distribution.
uZito is a balancing game, using pieces of different weights. The game advertises that it only has one basic rule: take a piece and put it on the top. Additionally, the publisher notes that the rulebook has almost no language in it, and the game can be easily understood through visuals alone.
The games' pieces appear to be floors, metal pillars, abstract muscular humans, large stones, and stacks of medium stones.