3-Hand Casino Hold'em is essentially a casino version of Texas Hold'em poker — but unlike regular Texas Hold'em, you do not play against other players; you play against the dealer's hand. The key feature is that three separate hands are dealt at the same time, giving you multiple decision points each round.
At the start of each round, an ante bet must be placed on each hand. The dealer then deals two face-down hole cards to each hand and keeps two face-down cards for themselves. Three community cards (the flop) are then revealed in the middle of the table. After seeing the flop, the player evaluates each hand separately and makes an independent decision for each — either "call" to continue (placing a call bet, usually twice the ante), or "fold" to give up that hand's ante.
If you call, the dealer reveals the remaining two community cards (the turn and river) and shows their hand. Both sides make the best five-card hand from the five community cards and their two hole cards. The dealer must make at least a pair (fours and tens or better) to "qualify" — if not, certain bets are treated differently. Each hand's result is determined independently, so you can win one hand and lose another.