Bi-Dice are specialized game pieces that are thrown like dice and land in one of two states.

They are designed as an improvement over coin flips and double-sided checkers. Several Bi‑Dice shapes exist, and the outcome probabilities can be customized during manufacturing.

Oyno is the first game to feature Bi‑Dice with a prism design.

Tri-Dice come to rest after a throw in one of three states: vertice, edge or face.

The Bi-Dice effect manifests in that when several tokens are tossed from the hand at once, the probability distribution changes. The reason for this is the difference in the surface areas of the Bi‑Dice’ faces. This effect is controllable and can itself be used in the rules of a board game.

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