Rules of Omaha
Omaha is a game derived from Texas Hold 'em. There are only two differences:
1. In Omaha, players are dealt four hole cards (instead of two).
2. Final hands must be comprised of two of their pocket cards, and three community cards. This is even if a better hand could be achieved by using more or less hole or community cards. For example in Hold 'em, a player can "play the board" if all 5 community cards make their best hand. This is not the case in Omaha, a player must play 2 of his hole cards (no more, no less).