I feel this might still be abusable at some point.
@Kirin-kun
Checkers would have been simpler. @Vasqueztion
The only reason its considered Japanese, is because some Japanese bussiness man put up a patent for it in the 1970s
Honestly, playing cards would have been the best. There are simple games like War and Go Fish, and there are complicated games, like Poker and Blackjack, production costs are probably slightly lower which would make the game more accessible, and it's easier for even regular folk to create their own games.
To be fair he can only make games that he is familiar with. It is impossible for him to introduce games that is not known in japan or at least he does not know about. Since he is japanese he can only do famous japanese games.
20% idea/licence, makes sense
10% sale fee, taxes (odd to have 1 level of taxes set by creators instead of rulers)
30% materials/production, makes sense
20% transportation, stuff needs to go places and they need to be paid
20% profit for the shop, from which personnel and everything still has to be deducted