Someone creates a unique 4 digit pin. Free choice.

The secret behind Checksum allows you to read their mind and know that number, every. Single. Time.

Checksum uses no magic apps, no toxic force, and the spectator's borrowed phone.

It's based on a stupidly simple math principle that anyone can do. If you can do this in your head... 6-3 = 3, you can do this effect.

Here's the sneaky bit. After you reveal their freely thought-of PIN, you'll secretly know their exact date of birth. They'll have no idea how you got it.

Now you can do birthday reveals, star sign reveals, one-ahead routines, and much much more.
 

• Checksum is not the toxic force.
• It uses no custom magic apps.
• It can be done on their phone.
• ... and it's so simple even a chimp can do it

With Checksum, you'll always be ready to perform - and even if you like using magic apps, knowing Checksum will give you an iron-clad backup should they ever fail.

Checksum by Mark Lemon is an unexplored, borrowed-phone phenomenon that you can learn INSTANTLY.