Twenty One

21 or Bust is a skill-based variation inspired by Blackjack rules. The core objective is to strategically place cards into four columns to create sums of exactly 21. Once a column reaches 21 or more, the cards are cleared and the player scores points based on how many cards were used.

Unlike traditional Blackjack, there is no dealer—instead, players compete against each other by trying to score as many points as possible. The twist? Both players receive the exact same card sequence, ensuring a level playing field where skill, not luck, determines the winner.

Players play asynchronously, with each game consisting of 52 cards and lasting up to 3 minutes. Your final score is matched against a real opponent who faced the same deck and constraints.