Secret message is a game 

how to play secret message 

first write letters till A to Z in the formate given below 

A B C D E F G H I J K  L M N O P Q R S T U V W X Y Z

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

Then if you want to write 

Hello instead of hello you will write 

8 5 12 12 15 this means hello