You can do this 3 times before the slow down are cancelled out. It will now be very easy to line up 777 for a 18,000 coins win. Once you gather these items, increase the bet to the maximum 90 coins, activate you double score bonus, and activate 3x slow down. The slow bonuses can be stacked, meaning you can accomplish this with the following combinations (number represents the slow down value): -3 -2+1 -1+1+1 (but if you use this you will have to forego the 2x score bonus mentioned above). 1x Mega mode bonus (x2 multiplier) - A bonus or combination bonuses that will cause 3x slow down on the machines. The point is to play that 10 coin bet until you gather specific items, namely a combination of score boost and slow down bonus or bonuses. Purchase around 3000 coins, choose a slot machine (they're all the same), and play the minimum bet over and over. This requires a bit of patience but should let you purchase every price in a couple hours. There is a way to make a LOT of coins on the slot machines. If you can, bring a set amount of cash with you with the intention that once it’s gone for the day, you’ll leave the casino.
Decide beforehand how much money you’re willing to spend, and assume that you aren’t going to win anything. Slots in Ni-no Kuni have the ability to use items, which allow you to adjust the spins positively or negatively in your favor. Set a budget for yourself before you head to the casino.
