Blue Star
Blue Star
  • First Appearance
Luigi's Mansion 4: Haunted Dreams (2009)
  • Latest Appearance
Luigi's Mansion 5: Curse of the Mansion (2010)

Blue Power Stars (also known as Cosmic Stars) are hidden Power Stars that first appear in Luigi's Mansion 4: Haunted Dreams.

There is a total of five Blue Stars in Luigi's Mansion 4: Haunted Dreams. Collecting them all gives Mario and Luigi access to the Blue Garden, which allows them to go into five secret mansion levels.

Blue Stars make a reappearance in the Luigi's Mansion 5: Curse of the Mansion. This time, there are 150 as opposed to 5 from the game's prequel. Blue Stars only appear when an area is haunted by a Blue Spirit. Blue Spirits are unlocked after getting all 150 Power Stars and defeating the final boss for a second time. Each mansion has the exact number of Blue Power Stars compared to normal Power Stars (except for the Legendary Mansion, which has no Blue Stars). The player will also have to redo a certain level in order to receive a Blue Star. They are normally found in hidden places or hard-to-reach places.

Despite their involvements in the previous games, Blue Stars do not return in Luigi's Mansion 6: U Are Doomed!!.