I think no one have invented a fish arcade game that you can play with your altcoins and bitcoin because the common games that are invented in a gambling site are table card games, slot games, sports bet, lottery, and dice games that these games are mostly played by gamblers in a real casino. It is also better if someone will make a fish arcade game in a gambling site, but i think only few people will play to it because it is not that exciting that it seems.