When you go to Zone 30. Maison Forest, Urban Center, and you begin your investigation, you will meet with 5 brothers, who call themselves Super Special Quiz Brothers. They will give you a quiz to solve. Which is quite simple.
Each of them will tell you something, but only one of them will tell the truth.
First brother, “The fourth brother is a liar”
As you see, this is eliminating all the other boys from the list because either he or fourth brother is the one who tells the truth.
Second brother, “The f-fifth brother tells the truth”
If the fifth brother tells the truth, it means that the second brother also tells the truth. Which means both boys are lying.
Third brother, “We lied before! Both the first AND second brother tells the truth!”
Another lie because only one of them will tell the truth. Also if the first and second brother tells the truth it means that third and fifth brother also tells the truth. So here we have our correct answer already, the one of who tells the truth should be the fourth brother.
Fourth brother, “The third brother is absolutely lying to you”
Yeah, we figured it out already that third brother is lying to us, which confirms that the fourth brother is the one who tells the truth. 😉
Number five, “I tell the truth. Number three does, too”
No, he is not, neither does number three because only one of them will tell the truth.
And here you have your answer, the fourth brother, peppy boy is the one who tells the truth.