How are instant scratch off tickets printed and distributed equally

Does anyone know how instant scratch off tickets are distributed. For instance a game has 20 million tickets printed how are they distributed so that the 6 top prize tickets are distributed equally and throughout the 20 million tickets evenly so that all 6 do not happen right away or in one shot etc etc. I ma just wondering if anyone really knows how this system works?

In my opinion, the top prize tickets are distributed in the largest cities.  Reason : more publicity.

No, larger cities probably have more prizes in them because there are more places for more tickets to be sold thus more tickets ARE SOLD and the likelihood of prizes to be claimed within a larger city is greater.  I live in Springfield, Illinois and the majority of instant winners come out of Chicago.  You know why?  Because Chicago has a few million more people and a few thousand more retailers than Springfield does, if Springfield had a rash of big prize winners I'm sure somene would cry foul.

That being said, OP I would suggest you look at the odds on the top prize of any scratch off ticket and how many of those top prizes are available.  If say there are 10 top prizes and odds are 1 in 20 million to win, 10 x 20 million = 200,000,000 tickets.