Super Mario Sunshine: King Boo Down Below - 999 Coins Collected (Max Coins)
Chronologically, I did this mission after Pianta Village's "Piantas in Need". This one took a good 4 hours worth of gameplay, though this one was thankfully way more engaging than "saving" one Pianta over and over again...
There are actually a couple of things to note here! For one, you can go into the boss fight with about 125 coins, so you don't have to farm every single one from the boss. Despite triple coins being a possible slot outcome, it only shows up when you are at low health and I'd guess that it can only appear 3 times per attempt, so your best method for getting coins will be from the bloopers and electrokoopas that show up every once in a while from the triple ? outcome. If you run out of water, you can stomp on five boos to get a water tank refill.
Oh yeah, and eventually the coins become invisible. They can still be collected but you'll probably miss a coin or two every now and then, which is annoying.
*This run was done on Super Mario 3D All-Stars for the Nintendo Switch
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