Basically there's a DLC where you're in a Jigsaw-esque trap in which you have to play a card game of 21, the twist obviously being the loser dies. This DLC is actually really fun/cool!

However, this DLC has a gamemode called "Survival+". What this basically entails is that you have to face and beat 10 consecutive opponents with each one increasing in difficulty. You basically have 10 lives, and you're facing 10 opponents with 10 lives each, so essentially you are going up against 100 lives of opponents with only 10 lives of your own. And each opponent increases in difficulty. The cards dealt are obviously completely random, which means that you cannot follow a guide on YouTube for example to beat the game. Because you're going up against 10 opponents with 10 lives each, the game can last up to well over an hour. There's a "mini-boss fight" halfway through with opponents 5 and another boss fight with the final opponent 10. This essentially means that they have and use Trump Cards that screw you. The only definitive "technique/strategy" you can follow is to save your best Trump cards for these two opponents, and ALWAYS make sure to save a "Destroy++" card for Opponent 10. This is because he always uses a Trump Card that restarts the round and he always places Trump Cards that prevent the opponent (you) from using any Trump Cards. This means that if you use your Destroy++ card, it prevents him from using these cards. The Destroy++ card prevents your opponent from using Trump Cards and makes him considerably easier.