Players can also buy gems outright without needing to purchase a mine. In this case, all mine-owners will split a reward of the same number of gems that were purchased directly. The gems can also be sold for Bitcoin within the game, and all the transactions will take place through Counterparty. “[Uninitiated] people will get into Bitcoin easily,” the dev predicts.
http://cointelegraph.com/news/112827/spells-of-orbital-the-first-game-that-uses-bitcoin-and-blockchain-technology-announced