Thanks for your reply!
The game basic is that A = 1... B = 2 and so on. Well, to make it up to 780 (Full Score) , You need 30 time Z repeated. This is it (Confirmed). As I'm a developer, I can confrim this,and no more theories ! The developer is smart to make around 1K people dig about theories and so on,while the game coding is another thing (Simple as much as I can see).
Hope I didn't ruin your party guys.
#Alaa_Out.