Great question 🌌! The “last level” of Super Mario Galaxy depends on whether you mean the final story mission or the true final level after 100% completion. Here’s the breakdown:
🏰 Final Story Level (Main Ending)
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The last main mission is “Bowser’s Galaxy Reactor – The Fate of the Universe.”
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This is the showdown with Bowser at the center of the universe.
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After you beat Bowser here, you’ll see the credits roll.
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It requires 60 Power Stars to unlock.
🌟 True Final Level (100% Completion)
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Once you collect all 120 Stars with Mario, you unlock Luigi as a playable character.
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After collecting all 120 Stars with Luigi as well (242 stars total), you unlock the Grand Finale Galaxy.
🎇 Grand Finale Galaxy
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This is the “true” last level of Super Mario Galaxy.
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It’s a peaceful stage where you revisit the Mushroom Kingdom Star Festival from the game’s intro.
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You collect 100 Purple Coins here, earning the final Power Star and completing the game at 100%.
✅ Quick Answer
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Main last level: Bowser’s Galaxy Reactor – The Fate of the Universe
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100% last level: Grand Finale Galaxy (after 242 stars)