Dragon Knights of Valeria 2: Universe (or, for ease of use, DKV2), is a space-faring MMO supporting various cryptocurrencies (Bitcoin, Litecoin, Doge, HYPER, GoldPieces) as well as its own in-game currency (which seems, as far as I can tell, to have its own blockchain and will be tradeable in-game for real cryptos).
It's in open Beta until the full launch on 28th March, when all accounts will reset (although any cryptos deposited to buy account upgrades will be put back in your account at the reset). You can take a look now, not all functions are implemented yet but it's fully operational otherwise:
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