The players slip 24 metal tubes of different diameters inside one another on 3 building sites. In addition there are six slim wood columns, which remain visible only if their tips rise up beyond the highest edge of the metal tubes. Each player possesses the game components of one color, but both players may also block the opponent's tubes and wooden rods. To see and be seen... that's all that counts during the final scoring: The player who has more visible game components at the end of the game wins.

San Ta Si is a spatial hiding game for tinkerers who love to build.