Three parallel Omaha boards, but the worst one gets eliminated before showdown.
Button and blinds.
Four hole cards, three separate 3-card flops with their own turn and river cards, then the board with the lowest river card gets thrown out.
Small bet preflop and on the flops, big bet on the remaining rounds.
Pot splits high/low across whichever boards survive — high and low hands can even come from different surviving boards.