Goomba's Greedy Gala is the fourth board. It has a difficulty rating of two out of three.
Points of Interest
Roulette Wheel
The ball determines which path you take. If you pay Goomba 20 coins, you'll go in the direction of the star. If you don't, the ball might land on a star, letting you choose your path and giving you 20 coins.
Dice Duels
There is one of these on three of the paths. Goomba appears and tells you how Dice Duel works. He rolls a number and you have to roll a number higher than his. If you roll higher than Goomba (or if Goomba rolls a "1"; which is an automatic win), you win 10 coins. If you roll lower than him (or if he rolls a "10"; which is an automatic loss), you go back to the start. The Goomba tends to roll higher when you're in first or second place, but it's not guaranteed.
Happening Spaces
If you land on one, you'll sit on a chip and Goomba will start you on a diagonal path. Tilt 
left and right (whichever the chip is moving) to grab as many coins as possible.
Mini Mini-Games
In 3-Card Goomba, three goombas each have an item. After they move around, use to select a goomba and 
to choose it.
In Coin Slots, you get to press when the wheel is showing the number you want. If only two numbers match at the end, you get one coin (2/3 chance). If all three numbers match at the end, you get 5, 10, or 20 coins based on the number you matched (1/27 chance of each).