Each playing piece has colored rings attached to its top and bottom faces; the color of the ring that's showing indicates how the piece moves. At the start of your move, you can flip the top piece in a stack over, changing how that piece moves. And your opponent isn't allowed to look underneath your pieces to see what might be there. With this significant bluffing aspect, tied to the transformation of units, as well as two very different ways to win, Plateau is a unique abstract strategy game. Online Play Boardspace.net (real-time) GamesByEmail.com (turn-based)