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.
Mexican Poker is played similar to the five card stud format using only 40-cards plus a joker. The eights, nines and tens are removed from a regular deck of cards. The joker is wild unless it is exposed by the dealer. If exposed, the joker can only be used as an ace, straight or flush.