A typical cryptarithmetic is:
S E N D 9 5 6 7
+ M O R E + 1 0 8 5
----------- -----------
= M O N E Y = 1 0 6 5 2
On the internet it is said: "The invention of Cryptarithmetic has been ascribed to ancient China." But I don't find some evidence.
The statements sounds dubious to me since china doesn't have a letter system. Notwithstanding problems with ancient position systems. Could somebody explain?