Lost Marbles is 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 Snoring Valley.
Lost Marble Location #1
Head to The Rampant Parts which is located to the northeast of Queen’s Gate, then keep the wall to your left and you’ll find the Lost Marble sitting at the edge of the cliff.
Lost Marble Location #2
Once you’ve completed the main quest which takes place in Queen’s Gate, return to the Castle and you’ll see a previously locked gate now half open. Here you’ll want to head to the back of the room to find the Lost Marble but beware of the traps.