The key to solve the puzzle is to pay attention to the clues.
1. How can the person who knows the game will come up with an answer almost instantly?
If it can be answered almost instantly, then it means that the calculation is simple and not complicated.
2. What's with the name of the game that makes it significant?
If the name of the game is significant, then it could be a lead to solve the puzzle!
You don't need to be very smart to solve the puzzle, a common sense and a little of logic will do. 'yos?
