Objective: Beat the dealer's hand by having the closest score to 21. The other players don't matter. The only objective is to beat the dealer's hand.
Setup: Each player is dealt two cards, either face-up or face-down.
Rules: Players start with 2 cards. Each card is given a value -- face cards are worth 10 points, aces either 1 or 11, and number cards have their respective values. Going over 21 results in a ‘bust' and an automatic loss. There are specific plays that one can make, starting at the left of the dealer.
Hit: Taking another card. This can be done until the player is satisfied with their total or they go bust.
Stand: Taking no cards in that round.
Split: In the case of doubles, a player can opt to split them up and hit on both hands.
Double (Double down): (In the case of betting) a player opts to double their bet and take only 1 more card. This is done when the player is extremely confident that they can have a winning hand on their third card.
Blackjack: When a player is initially dealt an ace and a face card, they immediately beat the dealer.
The dealer also has very specific rules. They MUST hit to a value of 16, and then stand on 17. If the dealer has blackjack, all players (unless another player also got blackjack) automatically lose.
"Dealer-less" Blackjack (AKA 21)
Objective: Have the closest score to 21 out of all players.
Setup: Same as above.
Rules: Same as above, without the dealer rules.