Not exactly. I'm talking about one, where the randomness is coming from the blockchain.
There are
http://bettingblocks.com/ and
http://block777.com/, in which you can gamble on which pool will find a particular block.
I have also seen a few sites that allow people to gamble on the block hash or the "nonce" of the block (eg. Is the last number in the hash odd or even? Is the last two digit of the nonce <50? etc), but those sites didn't seem to get much attention and soon disappeared.
^These are the only games which are dependent on randomness of blocks, there are other which are on chain games but are not based on blockchain, it is what I think OP is asking. There was a game where you'd need to pick the block size to win but it wasn't too successful iirc. The block timing has to do with a lot of that, sometimes a block takes more than half an hour and people get bored waiting for it, which is why most prefer off-chain and games not based on blockchain.