To complete Super Mario Galaxy's main story, Mario must collect 60 Power Stars. There are 120 Power Stars scattered across the galaxies in total, and 7 of them are Grand Stars. Collecting them all earns you the chance to replay the game from the start as Luigi, bringing the total star count to 240. Collecting all 240 stars unlocks a final task for both characters, taking the final number to 242.
If you approach the Green Toad swinging a pickaxe in any galaxy and throw a Star Bit at his face, his cheerful expression instantly turns to sorrow. This sad state lasts until the galaxy is completed or you lose a life. He is the only Toad who reacts this way.
Rosalina entered the Mario universe for the first time with this game. From that day on, she became a recurring character who appears in many Mario games.
The Star Bits that Lumas devour with delight were designed with inspiration from a Japanese confection called 'konpeitô'. These tiny, colorful, star-shaped candies inspired both the look of the particles in the game and the character of the sweet-toothed Lumas.
Rosalina is known as 'Rosetta' in the Japanese version, while the Lumas are called 'Chiko'. These name differences reflect the subtle touches of cultural adaptation applied to the characters.
This was the first time a live orchestra recording was used for in-game music in the Mario series. Koji Kondo had previously composed an orchestral piece for Twilight Princess, but Nintendo had stuck with synthetic sounds, believing orchestral music would break the 'game feel'. In Super Mario Galaxy, however, the Kondo demo played by Mahito Yokota fit the space theme so well that, with Shigeru Miyamoto's approval, the entire soundtrack was recorded with a 50-piece orchestra.
Luigi appeared in a 3D Mario game in the main series for the first time in this title, and moreover as a playable character. It was the green-capped brother's first major outing in three-dimensional adventures.
When you throw a Star Bit at a Luma in the Observatory that isn't hungry, it thanks you. This small detail is a nice example of the warm interaction the game builds with its cute side characters.
Composer Mahito Yokota initially prepared cheerful pieces with a Latin American flavor for the game and made more than 20 demos. Although Yoshiaki Koizumi liked the idea, Koji Kondo, the series' most experienced voice on sound, objected, saying Mario was 'cool' rather than 'cute'. When Yokota was on the verge of resigning, three months later he played Miyamoto three pieces in different styles; the orchestral work Miyamoto chose was in fact Kondo's. This episode led the game to acquire a fully orchestral sound.
Yoshiaki Koizumi wrote the text of Rosalina's storybook at night, in secret from everyone. When he presented it to Miyamoto the next day, Miyamoto could not hide his astonishment at this secret work. And so an emotional depth was added to the Mario universe.
Yoshiaki Koizumi, who had trained in cinema, wanted to add story elements to give the Mario series an unforgettable experience. The introduction of Rosalina and the Lumas created such an opportunity in a Mario game for the first time. Koizumi also added that he felt storytelling in Mario was, as it were, forbidden.
The game was re-released on Nintendo Switch twice: first in 2020 as part of the limited-time Super Mario 3D All-Stars collection, and then in 2025 both on its own and together with Super Mario Galaxy 2, ahead of The Super Mario Galaxy Movie (2026).
The game's global planet mechanics are inspired by Super Mario 128, the GameCube technical demo Nintendo presented at the Space World 2000 expo. That demo had laid the foundation for the idea of round surfaces that play with gravity.
Director Yoshiaki Koizumi at one point very much wanted the game's storybook to be published as a real children's book. The idea grew out of a desire to carry Rosalina's touching story beyond the game.
GameStop ran a special campaign for those who pre-ordered the game: Mario would call you and leave a voice message reminding you of the day to go pick up your copy. This creative marketing stirred up a sweet excitement among fans.
The cheerful theme of the Toy Time Galaxy is in fact a rearranged version of the famous Ground Theme from the 1985 Super Mario Bros. This nostalgic touch is one of the nods to the series' roots.
Although the game was officially localized for China, it was not released there until 2018. The reason was that the iQue Wii was cancelled in 2008 and the game was shelved.
If you look carefully at the reflection in the star orb on Kamella's wand, you will see the Nintendo GameCube logo. It is a small, clever surprise hidden by the developers.
The developers initially planned to base the game largely on pointer and motion controls. But they abandoned the idea, thinking that a Mario game without direct control of the character would not reflect its spirit.
That captivating galaxy atmosphere seen in the background of the game's logo is a photograph of the real Andromeda Galaxy. This choice adds a scientific reality and splendor to the game's space theme.