he Kialara Labyrinth coins are perhaps the first interactive physical bitcoins. While the hologram and private key are on one side as usual, the other side has a labyrinth game that can be played by tilting the coin to control the bearings inside. The coin comes in two versions; one with ceramic bearings and another with pure .999 Silver bearings. These coins can be distinguished from the other side by virtue of the red surface on which the public key is written. They are denominated as ‘100,000 bits’, which is equal to 0.1 BTC. One bit is equal to 100 Satoshi.