BluGame games · Rules and features

21 — rules and features in the BluGame app

2–4 players

A Polish twist on blackjack, dealt from a cryptographically shuffled deck. Draw cards trying to get closer to 21 than the rest of the table — no dealer, no real money, purely for points.

Availability

This game isn't available in the iOS version. On Android it works as usual.

Rules

How to play 21

These are the same rules the app shows players in the game menu.

Goal

Collect cards worth as close to 21 as possible without going over. You win a round if you have the highest total among the players who didn't bust (go over 21). A match is a series of rounds — what matters is your total score across rounds, not any single round's result.

Card values

Number cards (2–10) are worth their face value. Face cards count DIFFERENTLY than in standard blackjack: Jack = 2, Queen = 3, King = 4. An Ace counts RIGIDLY as 11 — it's never reduced to 1, so a hand with an Ace can still bust. The one exception is Persian 21 (two Aces as your starting hand) — an automatic round win. This is the most common source of arguments at a table with players who know a variant where the Ace is flexible — worth clarifying before the first round.

Taking your turn

Every player starts the round with two cards. On your turn you choose: "Draw" (take another card) or "Stand" (keep your current total and end your part in this round). You have a limited time to decide — once it runs out the game stands for you automatically, so stepping away from the screen for a while doesn't block the rest of the table.

Round result

Once everyone has drawn or stood, the totals of the players who didn't bust are compared — the highest wins the round and its owner gets 1 point. A tie for the highest total (several players with the same value) does NOT split the point — the round ends with no winner, no one gets anything. One rule overrides everything else: two Aces in your first two cards is a Persian 21 — an automatic round win regardless of the other players' cards, even if someone else also has 21.

If a player disconnects

Losing the Bluetooth connection mid-round counts as a bust — a disconnected player can't win that round. If they had already stood or busted before disconnecting, that result stands — disconnecting doesn't undo something already decided.

Winning the match

A match runs for a set number of rounds, but can end earlier — when only one active player remains at the table, or when the result is already mathematically decided (no one else could catch up to the leader even by winning every remaining round). After the last round, whoever has the most points wins. A tie for first place triggers one extra tiebreak round — and if that ends in a tie too, another one, until the tie is broken.

Example

What a game looks like

Step by step, the way it plays out at the table.

The deal

Ala, Bartek, and Celina sit down at a table set for 5 rounds. After the SRA shuffle, each of them gets two cards: Ala has a Queen and a 7 (10 total), Bartek has a King and an Ace (15 total, the Ace counts as 11), and Celina has two Aces — a Persian 21! Before anyone else can even draw another card, the round is already decided in her favor.

Decisions at the table

In the next round, no one has an instant result. Ala, with a Jack and a Jack (4 total, since face cards count as 2 in this variant, not 10), draws several cards in a row until she stops at 19. Bartek, with a Queen and a 9 (12), draws one card — an 8 — and lands on 20. Celina, with a King and a 10 (14), draws another card, a Jack (2), bringing her to 16, and decides to stand, judging further drawing too risky.

Round result

The three compare results: Ala 19, Bartek 20, Celina 16 — no one busted, so the highest total counts. Bartek wins with 20 and gets a point. If Ala and Bartek had tied, the round would have ended with no winner — a tie for the top doesn't split the point between the tied players.

A few rounds in

After four rounds, Bartek leads 3:1:0. The fifth, final scheduled round won't change the standings anymore — even if Ala or Celina won it, neither could catch up to Bartek. The game ends as soon as the result becomes certain, without playing out the unnecessary last round.

In the BluGame app

What the app does for you

What happens in the phones and what stays at the table.

Shuffling without a dealer

The deck is shuffled cryptographically across the players' phones — no single phone, including the host's, knows anyone else's cards. Nobody has to play dealer.

A time limit per move

When the decision time runs out, the app stands for you — a player away from the screen doesn't hold up the table.

Disconnects without arguments

Losing the Bluetooth connection mid-round counts as a bust for that round, and anything already settled stays settled.

Scoring and match end

The app keeps score (including the Persian 21), ends the match early when the result is settled, and runs a tiebreak round on a tie.

Platform

The same in every BluGame game

No internet, no server

Phones connect directly over Bluetooth — game data never reaches the internet.

No account

You don't create an account or log in — you sit down and play.

Everyone in their own language

Each phone picks up its own language, so at one table everyone plays in theirs.

Custom

Standard and Custom

Standard is the full game for everyone. Custom is an option for venues and events — it adds the venue's logo and welcome text and a few extras.

In the Standard version

  • The full game, freeAll the rules described on this page, tables over Bluetooth, no account and no internet needed during play.
  • An Ace is always 11A bust is a bust — the Ace never drops to 1 (exception: the Persian 21).
  • Default card styleClear cards in the simple, default style.

With Custom enabled

  • Venue logo and welcomeThe venue's logo and its own welcome text on the app's home screen.
  • Your own text on the gameA banner with the venue's own text (e.g. house rules, notes for players) on this game's screen.
  • App themeA ready-made visual theme for the whole app during a session at the venue.
  • Featured gameThe venue can highlight this game on the app home screen.
  • Flexible AceAn Ace counts as 11 and drops to 1 when the total goes over 21 — as in classic blackjack. Switched on with a single toggle.
  • Richer card visualsCards in the style of a traditional deck — with an index, court figures and the BluGame motif on the Ace, instead of the default, simpler style.

Learn more about Custom →

More games

See the other games

Play 21

The app is free, with no account and no internet needed during play.

Get it on Google Play