The feeling of ups and downs came too quickly. After passing through so many levels, how high were the expectations for the finish line before, and how disappointed the three of them were now.

Kewen knew that normally, what should be in this terminal room, so when he saw that the room was empty, he understood that he had come early.

Obviously, Dumbledore hasn't put the 'Mirror of Erised' over now, and the 'Sorcerer's Stone' is naturally not here either.

After making guesses, Kewen simply stood at the door and didn't move, while the twins relentlessly probed around to see if there was any other mechanism here.

Unfortunately, more than ten minutes were enough for the twins to search every floor tile and wall crack, but they still found nothing.

"Hey..." George stood up and sighed helplessly: "Is that the case? Then why did we overcome the difficulties before."

Fred was equally disappointed, and asked Kewen, "What about you, Kewen? Did you find anything?"

"No." Kewen shook his head: "It's estimated that we came early. The last thing, maybe the principal's side is not ready."

"Okay..." Fred accepted Cowen's guess, and then stretched out tiredly.

George had returned to Kewen at this time, turned around and looked at the whole room again, then chuckled and said, "But it's not without gain, at least we have a very successful expedition tonight."

"That's right!" Fred also quickly changed his mind, walking towards the door with a smile, while chuckling: "At least tonight will open our eyes."

"Should we go back?" Kewen asked the twins.

"Let's go, let's go, just a little sleepy." George turned around first, and went back the way he came.

Fred followed and said with a smile, "It's time to go back to sleep. Tomorrow morning is Snape's potions class. I don't want to be caught and deducted from him."

Kewen smiled and shook his head slightly. Today's adventure is really anticlimactic, not a successful punch-in.

Stepping to keep up with the twins, the three of them soon returned to the room where the potion was placed.

The twins turned to look at Kewen, waiting for Kewen to take action to extinguish the purple flame on the retreat.

Kewen was about to step forward, but he suddenly stopped, and after turning his head to look at the potion bottles, an idea suddenly popped into his heart.

Therefore, he immediately took out a piece of paper and a pen from the pocket where he cast the 'No Trace Stretch Charm', then bent over and wrote on the wooden table.

"what are you writing?"

The twins asked in unison, and they leaned over to watch, but because Kewen was leaning over to write, they didn't see the content.

Hearing this, Kewen continued to write and responded, "It can't be done in vain, I'll leave a hurdle here too."

After the twins heard it, they looked at each other, and then they all showed very interested expressions, and their smiles gradually became immoral.

Soon Kewen wrote the note, put away the pen, put the note on the table, and picked up the note indicating the correct potion.

The twins couldn't help being curious at this time, and immediately picked up the note left by Kewen, and put their heads together to watch the content on the note.

【5²-2³+2 *cos30 *tan60- 3√2 sin45 -3!-C(4, 2)=? 】

[The instructions for the potion and the way to pass through the flames are under the floor tiles corresponding to the answers to the questions. 】

【warn! warn! 】

[Only the floor tiles corresponding to the correct answers can be safely opened, and opening any wrong floor tiles will produce a powerful explosion! 】

George: "..."

Fred: "..."

George and Fred were dazed after reading the first line of text. At the same time, they raised their hands and rubbed their eyes. They looked at the note again, and it was still such a mess of things.

"What is this... what?" George turned his head to Kewen with a hellish look on his face.

At this time, Kewen was engraving numbers on the floor tiles in the room. Hearing that, he glanced back at the two of them and covered up with a smile: "That's a math problem in the Muggle world. I accidentally wrote it down when I was making money during the holidays. ."

The twins looked at each other again, and George immediately threw the note back on the table, as if he felt the note in his hand was some kind of dangerous item.

Seeing this, Kewen simply called the twins for help, and helped him use his wand to leave numbers on the floor tiles in the room.

Not long after, all 30 large floor tiles were marked with numbers, and then Kewen used a magic spell to lift the floor tiles marked with the number [5], and pressed the logical reminder note about the magic potion to 5 below the floor tiles.

Get up and clap your hands to be done.

Seeing this, Fred asked in confusion, "Didn't you say on the note that you are going to set up an explosive trap?"

"Haha! I'm not a devil." Kewen laughed and said: "I just mentioned it casually, it depends on whether our future explorers believe in those nonsense."

George was sluggish for a moment, then suddenly pointed and burst into laughter: "Hahahaha! You are the devil! Hahaha..."

Fred also imagined what would happen here in the future, so he couldn't help but burst into laughter. Of course, he also felt silent and gloating for the latecomers who didn't know who it was.

Next, Ke Wen once again extinguished the purple flame at the door with 'All Spells End', and then the three returned all the way.

However, after a while passing by the chessboard room, Kewen used the 'Recovery Charm' to restore all the pieces to their entirety, and reset the positions of all the pieces.

In the key room, Kewen re-added a strong 'locking spell' to the door; in the room where the devil's net was, Kewen turned the devil's net into a rope ladder.

In the end, the three of them carefully moved to avoid waking up the three-headed dog, and successfully opened the door and left the test venue arranged by Dumbledore.

After leaving the third floor, Kewen did not return to the Room of Requirement to rest, but returned to the dormitory with the twins and slept peacefully all night.

The days that followed were very calm. Apparently, the professors hadn't found out that the forbidden area on the third floor had been broken into. Otherwise, they would have come to the trio to ask questions. After all, the trio had a lot of criminal records.

In the blink of an eye, two months have passed since the start of school, and it's Halloween on October 31st.

The food at the festive dinner was naturally much more plentiful than usual, but it was a little unfriendly to Cowen, because all the food was sweets.

Cowen didn't like sweets very much, not to mention the sweets in the UK are particularly boring.

Therefore, at the dinner party, he could only choose a few foods that were not too sweet and greasy, and planned to go to the kitchen to add a meal to himself after midnight.

However, not long after the banquet started, the wooden door of the auditorium was suddenly pushed open, and this year's professor of Defense Against the Dark Arts ran in with a face full of horror.

As soon as the visual image appeared, the next moment, the memory in Kewen's mind emerged...