21 Blitz

Contains adsIn-app purchases
3.7
599 reviews
Content rating
Everyone
100K+
Downloads
Content rating
Everyone
In-Game Purchases
Learn more
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About this game

Blackjack strategy at lightning speed!

21 Blitz blends blackjack strategy with quick thinking in a fast-paced race for the highest score. Every match challenges you to build 21s, create scoring streaks, and outplay your opponents before time runs out. Every decision matters as you balance speed and strategy.

How to Play
Build 21s and 5-card stacks for big points while managing all four hands at once. Clear stacks back-to-back to earn streak bonuses and keep track of the cards in the full deck to maximize your score.

Compete with Friends
Invite your friends, compete head-to-head, and see who can claim the top spot. Every game uses a full deck, rewarding smart decisions, careful card tracking, and skilled play.

Why You'll Love 21 Blitz
- Fast-paced competition
- Head-to-head matches with friends
- Strategic card tracking
- Rewarding streak bonuses

Download 21 Blitz today and see if you have what it takes to come out on top.
Updated on
Jul 15, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Personal info, App activity and 2 others
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

3.6
563 reviews
Kevin Mariano
May 27, 2021
It's kind of sad ...The game itself is very good ...when it comes to your money (wow) not good. Example. 10 mins ago ..in a 30$ tournament. Was at the end of the game had a good score, the app crashed. Instead of posting my score ...it aborted me.. Contacted support,. Was told if they can't find a player to play in 7 days I'll get a refund ..So I just lost 30 bucks and not the first time...I'm done ( made a withdrawal What was not aborted ..deleted app..will happen to you also if you deposit.
217 people found this review helpful
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Coz
December 29, 2022
Search run 21 instead. This would be a great game if you could play it more than a few times without having to pay. After only a few games you either pay or wait hours to be allowed to play again. I mean four or five games and that's it? And the coast for a few more games if ridiculous. Uninstalled.
63 people found this review helpful
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Sam Loba
February 19, 2024
Do not play for money, The algorithm is not fair. Matched against the top players over and over. They say it's based on skill level, but that is a complete lie. They will one day be investigated for their false claim of a fair skill based algorithm.
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Tether Studios LLC
July 20, 2023
Hi Samantha, we are sorry to hear you are not having a great experience. Fairness is very important to us and our partners at Skillz. You always have the option to play free "z" games if you are not happy with the competition, please reach out to support@skillz.com with questions. - Tether Studios

What’s new

Bug Fixes and Optimizations
Content rating
Everyone
In-Game Purchases
Learn more

App support

About the developer
Tether Games, Inc.
contact@tetherstudios.com
2505 Anthem Village Dr Henderson, NV 89052 United States
+1 415-269-7543

More by Tether Studios LLC