This program is both a puzzle and a magic trick. Once you know the solution to the puzzle, you can use this information to perform the magic trick.

When performed, the magic trick will appear to your audience as follows:

An audience member is asked to choose any five cards from a deck of playing cards. The magician takes one of the five cards. The spectator enters the names of the other four cards into the program and presses the "Guess Card" button. The result is the name of the fifth card.

How is this possible? Figuring this out is the challenge that makes this puzzle so interesting.

Please note that the secret to performing this trick is not provided.

Therefore, if you are not familiar with the secret, you should first treat this program as a puzzle and try to figure out how it works. Enter different cards to see if you can figure out the rule that produces the name of the fifth card.

*** Do not download this app unless you enjoy solving difficult puzzles. ***

What’s New

Version 1.6

Updates for recent versions of iOS.

Minor cosmetic changes and bug fixes.

Ratings and Reviews

5.0 out of 5
2 Ratings

2 Ratings

Emawk05 ,

Great Little Card Trick

What a great little application; quite fun to reason about how it works under the covers. Once you figure it out, it’s endless fun to play the trick on the mathematical inclined.

Magicbri ,

Love this trick!

This is a killer little trick that will leave the know-it-all's out to sea! Took me more than a month to work it out, but well worth the challenge. I hope no one else dope's it out! My only beef is I would like a cooler interface. Thanks for this little gem, and definitely keep it a secret.

Ruby-Rube ,

It works, and it's one of the best tricks in the App Store

You just need to figure out the secret. Sit down with the app at your desk with a pen and cards... Follow the authors suggested tips and web site. Don't give up, it works and when preformed its a card miracle....


Daniel Horn
894 KB

Requires iOS 11.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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