my first idea would to be to select 5 schools and pick 20 children from each who play video games.
then they would respond to us about how well the game went, what the enjoyed, what they disliked, how well they did, and lots of other things..
then this would then start word of mouth for the people who enjoyed the game and would be a free advertising
you can put it on bus sides because lots of people see a bus everyday or get on a bus so would see the picture.
this would create lots of word of mouth from people who see the advertisment or have there opinions passed on and then have many people finding what it is.
another way is to start a website to tell people what it is and what it is about, you could then put the website address on the bus to let people know that there is an address that people can look at to find out more information about the game itself, and how it is made.
with people being able to no how things work they could be more interested in games and maybe if they make more games it would interest them even more. ]