# 21 Black — Brain training puzzle game > Merge cards to make 21 in this solitaire and blackjack inspired puzzle game. (iPhone/iPad app by Bit Free Games.) - Source: https://appshunter.io/ios/app/21-black/id1044373988 (this page in markdown: same URL + `.md`) - Developer: [Bit Free Games](https://appshunter.io/developer/1044373461) - Category: Games, Card, Puzzle - Price: Free - Rating: 4.80/5 from 5 App Store ratings · 1 written reviews indexed - Age rating: 4+ - Requires: iOS 8.0 · 48 MB - Languages: American English - Released: 2017-11-21 - Data updated: 2026-08-25 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/21-black/id1044373988/reviews.md ## What is 21 Black? 21 Black is a challenging puzzle game that mixes solitaire and blackjack. Your goal is simple: merge the cards to make 21. How far will you get? 21 Black Features SIMPLE GAMEPLAY Swipe to merge the cards horizontally or vertically, different numbers add up while identical numbers stay the same. Get to 21 and win! ENDLESS MODE Relax in endless mode and see how many 21's can you make PUZZLE MODE Choose from multiple puzzle sizes and collapse the entire board into a single 21. Perfect for training your brain to recognize patterns and build new strategies. SHARE + DISCOVER Played a cool puzzle? Share it with your friends and the world! Or scan puzzles other's have discovered with the built in puzzle camera scanner! NO STRESS Unlimited free hints and no time limits means you can relax and get into a flow 100% FREE That's right, everything is unlocked and there is nothing to purchase Fun and addicting gameplay that's guaranteed to test and train your brain in new ways! Questions? Please contact us at contact@bitfreegames.com ## Key features - Card merging gameplay - Endless mode - Puzzle mode with custom sizes - Share and scan puzzles - Unlimited free hints - No time limits ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/21-black/id1044373988/reviews.md ### 5/5 — Worth it!! *2018-03-02* This app is definitely worth the download ... it’s a must, to kill time. The simplicity and anticipation of this strategy game will have you on your toes. ## Frequently asked questions about 21 Black ### What is the main goal of 21 Black? The main goal of 21 Black is to merge cards horizontally or vertically to make a sum of 21. You can play in endless mode to see how many 21s you can create or in puzzle mode to collapse the entire board into a single 21. ### Does 21 Black have ads? No, 21 Black does not contain advertisements. The game is 100% free with everything unlocked and nothing to purchase. ### Can I play 21 Black offline? The provided data does not specify if 21 Black can be played offline. However, its gameplay mechanics suggest it is likely playable without an internet connection. ### What devices support 21 Black? 21 Black is supported on iPhone, iPad, and iPod devices. It is designed for iOS users. ### How often is 21 Black updated? 21 Black was last updated on February 17, 2019, with version 1.0.1. The initial release date was November 21, 2017. ### What is the age rating for 21 Black? 21 Black has an age rating of 4+. This indicates it is suitable for young children and general audiences. ### What makes 21 Black unique compared to other puzzle games? 21 Black uniquely blends solitaire and blackjack mechanics into a card-merging puzzle. It offers unlimited free hints and no time limits, promoting a stress-free brain training experience. ### How does the puzzle mode in 21 Black work? In puzzle mode, you can choose from multiple puzzle sizes. The objective is to collapse the entire board into a single 21, which helps train your brain to recognize patterns and develop new strategies. ## Version history (last 2 releases) ### 1.0.1 — 2019-02-17 +Bug fixes ### 1.0.0 — 2017-11-21 No release notes. ## Apps similar to 21 Black | App | Rating | Price | Category | | --- | --- | --- | --- | | [Cribbage Blitz](https://appshunter.io/ios/app/cribbage-blitz/id1447919543) | 4.8 (688) | Free | Games | | [Cards 21 - Puzzle Card Game](https://appshunter.io/ios/app/cards-21-puzzle-card-game/id6450538932) | — | Free | Games | | [Blackjack Jewels™](https://appshunter.io/ios/app/blackjack-jewels/id594960027) | 4.7 (191) | Free | Games | | [9UP !](https://appshunter.io/ios/app/9up/id1497107893) | 3.4 (9) | Free | Games | ## More apps by Bit Free Games - [Word Chef - Letter Pop](https://appshunter.io/ios/app/word-chef-letter-pop/id1044373462) - [Halfpipe Hero](https://appshunter.io/ios/app/halfpipe-hero/id1044374093) - [Don't Zap The Birds!](https://appshunter.io/ios/app/dont-zap-the-birds/id1044374284) - [Lemons](https://appshunter.io/ios/app/lemons/id1044377159) - [Smash Fu - Endless Arcade Smasher](https://appshunter.io/ios/app/smash-fu-endless-arcade-smasher/id1044953131) All apps by Bit Free Games: https://appshunter.io/developer/1044373461 ## Related topics [freeflow a21](https://appshunter.io/ios/topics/freeflow-a21) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-25.*