By adjusting the amount of money you put in to each pull of the lever. Slot Machine is a game of chance in the Tombstone Trail Casino. ni no kuni casino prizes. Tombstone Trail Casino is opened on the Tombstone Trail after learning the Travel spell. so far i have found a few tips. . I guess, it's also far and awa the easiest casino game and can win you the most money PERIOD. . There are four games of chance. Lastly its the Platoon game, this is like 30% luck and 70% skill, you need to come up with a strategy to win. Platoon is more like 70% luck 30% skill. Try.