In the meantime, here’s a Gamexplain video guide showing all 246 Star Coins and secret exits:
• The World 5: Soda? Jungle guide begins at 22:40 minutes.
• The World 6: Rock-Candy Mines guide begins at 30:40 minutes.
• The World 7: Meringue Clouds guide begins at 38:12 minutes.
• The World 8: Peach’s Castle guide begins at 44:49 minutes.
• The World 9: Star Road guide begins at 48:12 minutes.
[Work-In-Progress: More level-specific guides for Worlds 5-9 coming later if you want them]
Thanks to Nintendo & Bob for the star coins walkthrough videos.
Feel free to leave a comment if you have a question or to let us know if this star coins guide helped you.