blockchain based? Are you referring to that kind of lotto where your txn hets picked and win? I don't think there is tho.
Not exactly. I'm talking about one, where the randomness is coming from the blockchain.
I doubt any of the games mentioned above take randomness purely from blockchain. AFAIK, most big games uses gaming pattern recognition before generating random no. This does not ensure house win, but increases chance by many fold. This is not possible if randomness is taken purely from blockchain.