You can play many table games, including Blackjack, in Red Dead 2. This Where To Play Blackjack In Red Dead Redemption 2 guide will tell you where you can play Blackjack specifically, which is one of the requirements for the Gambling Challenge tree.
Red Dead Redemption 2 features 9 different challenge trees, each consisting of 10 unique challenges. These special challenges unlock new apparel that you can equip and wear to further customize Arthur in his adventures. Blackjack is one of the challenges in the Gambling Challenge tree.
Where To Play Blackjack In Red Dead Redemption 2
Unlocking Challenge trees can be tricky but thankfully, the Gambling tree is easily accessible as you have to play Poker to progress through the main story. Once you have completed the initial Gambling Challenge, you will unlock an additional challenge. This challenge requires you to double down and win a hand, 5 times in Blackjack.
To play Blackjack simply head to the Guest House in Rhodes. Head upstairs and you will find Where To Play Blackjack In Red Dead Redemption 2.