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[SPOILER]

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🔐 How do I get Marceline to help me unlock the basement? / What’s the OBEX code with Marceline?

Here’s how to unlock the basement and electronics shop: 

 1️⃣ Method 1 (Helicopter Concert Scene):

• Attend the concert and choose: "Make her grow her muscles in public."
• At the end, Marceline will give you the OBEX code to solve the basement puzzle.

2️⃣ Method 2 (Futa Finale Scene):

• Complete Marceline’s questline up to the final scene.
• Finish the "Muscle Shower" scene first.
• In the last scene, interact with the terminal in her room to get the code.