Golden Bullet Bills are a very rare type of Bullet Bill, that first appear in Super Mario Sunshine. These Bullet Bills have a golden, metallic shell which makes them far more valuable than the original species. Golden Bullet Bills are known to give a high amount of Gold Coins once defeated.
Golden Bullet Bills appear in New Super Mario Bros. 2. They are just regular Bullet Bills but when Mario or Luigi jump through a Gold Ring they become Golden and 5 Coins follow behind the Bullet Bills.