How to pass the 21st level of Brain Hole Master? I believe many players are still not clear about this, so today I will let the editor of Source Code Network show you how to pass the 21st level of Brain Hole Master. I hope it will be helpful to everyone!
Question: Which English letters do most people like to hear?
Answer: CD
Analysis: This is another question that opens your mind. Many people like to listen to music on CDs, so the two English letters CD are the ones that most people like to listen to.
