Omaha is a variant of Texas Hold'em Poker. Omaha is considered, by some, to be the hardest game of Poker to master. Of all of the different games of Poker, Omaha is for many the hardest to learn to play and the hardest to bluff in. It is played most often at fixed limits, like Texas Hold'em and pot limit.
With a population of around 211 million people, Brazil is the sixth most populous country in the world. That makes it a massive market to tap for online poker sites and more have continued to do so in recent years. The country has some interesting gambling laws, however. Gambling has been largely illegal since 1941.