Blackjack

Blackjack is a comparing-type card game which is the most widely played casino banking game in the world. It can be played in various casinos in New Vegas. Winning 10 hands of Blackjack grants you the Double Down achievement/trophy.

Rules
The player draws cards to an initial two card hand with the object of bringing the total hand value as close as possible to 21 without exceeding it, so that the house, which plays after the player, will fail to get up to the player's total, or will lose by exceeding 21. Blackjack is played in many variations at casinos with different table rules. In New Vegas, the maximum bets allowed are 200 chips, equivalent to 200 caps.

Exploit
If the player saves before they enter the table, they can play without risking any of their credits, and reloading their save if they lose to many chips. Immediately following each save reload, the dealer has a 56 second 'cooldown' time where they "swap out the deck as an anti-cheating measure" but no penalty is given to the player other then having to wait.

Casino Bans
As the player gets more money from the casino, a floor manager will approach them, offering increasingly valuable gifts to their "lucky player." If the player progresses passed all of the gifts, and accumulates too much money (the amount is different for each) then the casino will ban them from playing anymore games. The player can still use all of the casino's other functions (restaurant, theater, etc.) including cashing out their chips, but they are never allowed to play any money winning game in the casino. These bans are permanent.

Appearances
Blackjack can be played in Fallout: New Vegas.