KOZO, is a three-dimensional stacking game in which players build chimney-shaped towers out of polycubes placed onto a board. One round is composed of the two actions of placing one of the twelve polycubes and a balance stone within the confines of the 8 square-gridded base. The cubes of the positioned polycubes dictate the points awarded.
If a player's tower topples, they lose the game. The game ends when a player's tower topples over or if all the available polycubes have been placed. At the end of the game, the player with the highest score wins.
This game is a development of the designer's earlier game Ancient Construct. Since the raw materials were no longer available to make Ancient Construct, the designer revised the game, introducing a strategic element and expanding play to six players.