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I built a bot from parts, cost me about 0.3 ETH. Of the ETH based games I've played, it doesn't have the greatest payout though.

So what games have the best payouts?

I've been playing Ether Quest lately. There's a daily pot of 1-3 ETH in the tournament, which will go up as there's more players. Its a fun game, quite new and has a good community.