Blokus — One Placement Rule, Constant Interaction — Blokus — One Placement Rule, Constant Interaction

Mattel lists the current Blokus family game for two to four players, ages seven and up.

Each piece of a player's color must touch another of that color only at a corner, and the goal is to fit as many pieces as possible. The rule is brief, but every placement changes the space available to everyone else.