So, in a nutshell: players try to bluff each other by secretly playing cards a skull or one of their flowers. They'll then bet on how many flowers they think they can turn over. The winner is the first player to successfully win two rounds, in which they indeed reveal their predicted number of flowers.
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.