Lost Marbles are something you can find in the different zones you’ll visit during your adventure through Tiny Tina’s Wonderland. Here you’ll be navigated to the Lost Marbles which are scattered around Crackmast Cove.
Lost Marble Location #1 - The Supreme Port
Start at The Supreme Port Fast Travel and head northeast until you drop down into Judgment’s Wait, then walk southwest to find a shipwreck which has been split in half. Here you’ll want to climb up onto the top of the front half to find the Lost Marble.
Lost Marble Location #2 - The Supreme Port
Go back to The Supreme Port Fast Travel and head northeast until you reach the area full of buildings, then climb up the ladders in the center to find the Lost Marble sitting on a wooden platform.