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21 Skidoo

21 Skidoo

Card Counting Puzzler

8 ratings
4 reviews
With Ads
🎮 Games
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🧩 Puzzle

Archived App (Last seen on 12 May 2026)

This is an archived listing of the app previously available on the App Store.

Although the app is no longer distributed by Apple, you can still view its description, screenshots, version history, ratings, and metadata for reference.

Details

  • Released
  • Updated
  • March 7, 2023
  • May 1, 2023

Features

Developer

James Ho
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21 Skidoo screenshot #1 for iPhone
21 Skidoo screenshot #2 for iPhone
21 Skidoo screenshot #3 for iPhone
21 Skidoo screenshot #4 for iPhone
21 Skidoo screenshot #5 for iPhone
21 Skidoo screenshot #6 for iPhone
iphone
ipad
⭐4
Reviews↘︎
❓8 answered
FAQ↘︎
📦w/o updates
Updates frequency↘︎
🖼️Get Icon
Icons↘︎

About

A card-counting puzzle game inspired by Blackjack. Players add cards in any direction to reach 21 and clear the board. Avoid creating any 21s to win this addictive challenge.

✓Card counting mechanics
✓Board clearing puzzles
✓Blackjack twist
✓Addictive gameplay
✓Single player challenge
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What's New in 21 Skidoo

1.0.12

May 1, 2023

Fixed a mathematics issue. Fixed a typo. Fixed a visual transition glitch.

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User reviews

Most RecentHighest RatedLowest Rated

Great Game James

👍👍👍
FrankP922FrankP922

GREAT GAME!

I usually don’t play many card games because the rules are too complicated. This game however is super simple and easy to learn. It is super addicting. I was playing for at least an hour without even realizing time passed. It’s also a great way to way to keep your brain active with some simple math. All around great game and I have no complaints.
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ddsh1miniddsh1mini

Response from developer

Thank you so much for taking the time to play and comment on my game. I'm so glad you enjoyed it!

👍

This game is so addicting
TIFFATNYCTIFFATNYC

Response from developer

Glad you enjoyed it!

Give it a try!

Creative concept with cards; highly recommended.
SMY36738SMY36738

Response from developer

Thanks for the comments!

FAQ

What is 21 Skidoo?

21 Skidoo is a card counting puzzle game for iPhone and iPad. It challenges players to add cards in any direction to make 21 and clear the board without creating any unwanted 21s.

How do you play 21 Skidoo?

You play by tapping or swiping cards to add them together in any direction. The goal is to make combinations that equal 21 to clear them from the board. You lose if you fill the board with unplayable cards.

Is 21 Skidoo free to play?

Yes, 21 Skidoo is free to download and play. It is supported by advertisements, as indicated by its monetization model.

Does 21 Skidoo have ads?

Yes, 21 Skidoo contains advertisements. It is listed as an ad-supported application.

What devices can I play 21 Skidoo on?

21 Skidoo is available on iPhone and iPad devices. It is designed for iOS users.

How often is 21 Skidoo updated?

The latest version of 21 Skidoo is 1.0.12, which was last updated on May 1, 2023. Updates typically bring bug fixes and improvements.

What is the age rating for 21 Skidoo?

21 Skidoo has an age rating of 4+, making it suitable for a wide range of players.

Can I play 21 Skidoo offline?

While the description doesn't explicitly state offline play, many puzzle games of this nature are playable without an internet connection. However, ads may require connectivity.