In Omaha, each player gets four hole cards, must use exactly two with three of the five community cards, and bets through four rounds starting with the blinds.
Varation:
Omaha Hi-8: This is a split pot game where the lowest qualifying hand wins half the pot. If there is no qualifying low hand then the high hand wins the whole pot, (scoops). To qualify for low you need five unpaired cards 8 and under.