Answer
The answer is as follows. 
Katrielle and the Millionaires' Conspiracy walkthrough
Puzzle Location: Outside the Layton Detective Agency (Benny)
Roll up, roll up, and take your chance at a game of hoopla!
But this is hoopla with a twist.
Not only do you have to get the hoops to land over the pins, but you also have to throw a different number of hoops around the pins according to what colour they are.
Use the four rings to place one ring around each blue pin, two rings around each green pin, and three rings around the red pin.
Slide the hoops to pick them up and place them on the board.
The red pin needs three hoops, so think about how best to place them.
If you put them all in the same place, the green pins could end up with three hoops around them too, so you need to think carefully.
Place one of the hoops so that it goes around the red pin and the blue pin at the top-left.
Place a hoop so that it goes around the red pin and the blue pin right at the top.
Try placing another hoop so that it goes around the red pin and the blue pin at the bottom-left.
The two rings placed in hints two and three should each be encircling two green pins.
Now you just need to place the last hoop so that it goes around any pins that don't yet have the right number of hoops around them.
The answer is as follows.