It was Extreme Demon, the one who kidnapped the three cubes. Melty asked, "Why are you doing this?" and Extreme Demon laughed, "I want to know how you cubes work..." he told Melty, he broke a bottle on Zero's chamber, waking her up. She panicked, she didn't know how she got here, "What the frost?! How did I get here?!" she asked herself. "Shut up." Extreme Demon told her.
Extreme Demon put a spike in Melty's chamber, "Do what you dumb cubes usually do." he told him. Melty looked at the spike, he knew what Extreme Demon meant, but he didn't know where to go after jumping over the spike. It just leads outside, which he cannot access. He looked at Clipper, who was just looking at the blueprint, "Hey, psst..." Melty tried getting Clipper's attention.
Clipper looked at Melty, "I don't care." he said, he went back to looking at the blueprint. Melty realized, the respawning, he could jump on the spike... he would survive, right? He jumped on the spike, he didn't get hurt... the spike was fake?
He repeatedly jumped on the spike, it WAS fake.
