Players reverse bones on the drum to make all of them upper, being the first. Bi-dice (also called "bones") are the game special pieces. They are thrown and come to rest with equal probability in one of two states.
At the beginning the drum is empty. Each player has their own set of 8 bones on the ground. Pick up the bone to take the first turn. If you are holding a bone in your hand, place it in the upper position on any empty space. Otherwise, remove any of your bones from the drum, reverse all adjacent bones, move the bone to any empty space, placing it in the upper position, and then reverse all adjacent bones. If all of your bones already on the drum are upper, then pick a new bone from the ground and hold it for your next move.
In random mode (Wild Bones) whenever you place a bone during your turn, roll it first and place it as it lands.
Oyno Puzzles: Shuffle the bones and place 8 wild bones randomly on the spaces of the drum. Ensure that at least one bone is upper and leave the Center empty. To make a move select any upper bone on the drum and place it in the Center. Reverse all bones adjacent to the space you just took the bone from. Then move the bone from the Center to any empty space, placing it as an upper bone, and reverse all bones adjacent to that destination space. Continue making moves until all bones are upper. For the next level of difficult1y, add one more bone and start over.
—description from the designer
Abstract Strategy · Solo / Solitaire Game, Tile Placement
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