Naruto: Ultimate Ninja 3

One fastway is for you toget the money is to go to tanzoku town and talk to every one and give the 100 ryo to the guy who tell you to hit the jackpot fast and to the gampling place and talk to the machine that sparkle and don't worry about messin up because a lot of them sparkle but if it don'y sparkle don't use those and try to hit the head bands so you can hit a lot of times.

P.S. try to hit 99,999 meddles to get 20,000 ryo

Basically the easiest way to get the max money is to go to Tanzaku town. Go inside the building beside the slot machine building (you can tell what the slot machine building is since it has a slot machine outside) and talk to the only guy in there and pay him 1000 Ryo to tell you which machine is 'lucky'. Now go inside the slot machine building and go to the machine the guy told you was lucky and play it. Want you wanna do is line up 3 pictures of Tsunade to enter the roulette minigame (yes a minigame inside a minigame) and then pray you hit the x2, x3, x5 or x10 multiplier and rack in alot of coins. 99,999 tokens (the max you can get in one go) gives you 2,000,000 Ryo. So just get 99,999 tokens 5 times and there ya go,

one of the easiest ways to get so much money is to go Tanzaku town and play the leaf village story slot machine and hope to get three Tsunades. Then bet all of your money (you won't lose any ever) hope to get the highest multiplier. The highest money you can get is 99,999 tokens which is 2,000,000 Ryo. Do it five times and you'll be swimming in ryo.

there is two rumor about two lucky machines,to know wich one you must someone in a building that cost 1000 ryo and he will tell you this two people are at different place. that two can make ya a lot of money
to know wich is The Lucky Machine.the leaf story with minigame (if you got 3 same heads
ex:3 sunade head),the second machine you just need to hit it much time and BINGO! you
will always hit it (same animals). and you will sink because too much RYO.

OR you can do infinite missions and the one you find easy or on your skills do it.