The Golden Pig Machine is a puppet-mouthed machine that looks like the Golden Pig. Prince Porky drops it when you win Golden Fields - 3.
You can use 3 Lucky Coins to do one roll. But if you use 15 Lucky Coins you get 5 rolls plus another free roll. You can either get normal items or set items, when you get a set, you get a specific power. Each roll will fill up the rainbow bar. When the rainbow bar fills up, you have a 100% chance of getting a set item.
Before update ?, the 15 Lucky Coins for 6 rolls was replaced spending 20 Lucky Coins for a single roll that has a higher chance of getting a set item. It still fills the same amount of the 15 Lucky Coin roll.