Super Mario Galaxy: Guppy and the Underground Lake - 43 Coins Collected (Max Coins*)
The out of bounds strategy used here is identical to the one used in Bubble Blastoff. However, a new OOB trick initially discovered by Dendonodon allows Mario to travel to the Octoguy planet that normally requires the cannon to access! All that you need to do is perform a double jump while on the rock wall closest to the planet, then do a spin at the jump's apex. The hardest part is that you have to aim Mario toward empty space, and if he slips off the rock, it's game over. You also need to be as high up on the rock as possible so that you can get into the planet's gravity. It's not that hard of a trick, but considering the OOB tricks already being used in this mission, it's just another thing to keep track of.
Additionally, from the Octoguy planet, you can access the Gateway Galaxy ripoff planet as well! Unfortunately, it can only be done with Luigi alongside Co-Star. This gives a massive 53 coin improvement though! In conjunction with escaping the Ghost Ship area with 6 extra coins, that makes the max coins when using Co-Star in this mission increase to 102 coins!
*This run was done on Super Mario 3D All-Stars for the Nintendo Switch
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