I won?! Seems like it. My boarding ticket read "atari." Because it was an early flight, I just slept and didn't realize that I "won," whatever it means. But it is true that it's fun. Though ANA has rationalized (dramatically) in-flight services, which is perfectly OK for me because I don't like cabin attendants walking back and forth the aisles throughout the flight, this kind of game element delights passengers more, I guess.
Anyway, I will ask a cabin attendant what I won in my next flight.