Magic Guess

Open the game.

Tell your friend to take a two-digit number and keep it mind.
(Example 32)
Then tell her/him to add the two digits of that number.
(Example 3+2=5)
Then subtract the answer from the original number
(Example 32-5=27)

Tap on ‘Start Game’ button, you will find some cards with random images and number. Tell your friend to find the card with the number in her mind (card with number 27 in this example).

Click ‘Find Card!’ button, chant some magic words and/or do some magic actions.
Wait for some seconds, this app will find that card in her mind!

How it works?
If you take a two-digit number, add the two digits, and subtract the answer from the original number, final answer always a multiple of 9. That is the secret!