After passing through layers of crowds, they finally came to their destination, and the brother and sister were squeezed out of sweat in the winter. To avoid the crowds, they stood next to billboards on the sidewalk, just a few dozen steps from the Internet café. Looking at the door of the Internet café, which was already full of customers, Lu Daoheng showed a faint smile on his face, but Lu Yunqian was worried.

"This is it, are you ready?" Lu Daoheng touched his sister's head and asked easily.

"There are a lot of ......" Lu Yunqian looked at the full seat of the Internet café, her eyes showed a little fear, and she tugged at the corner of her brother's clothes with her hand uneasily, "Brother, is your puzzle to find something here, what if I lose it?" ”

"Don't be afraid, it's easy." Lu Daoheng said as he took out a note from his pocket and handed it to his sister, "Here you go, this is the first puzzle."

It was a boxy piece of yellow sticky note, with some frayed corners, and it looked like it had been in its pocket for a long time. As soon as Lu Yunqian received the note containing the puzzle, she became excited, and the uneasiness just now was instantly swept away, eager to know what was written inside. She first read the words on the paper, and then read them out seriously: "If you don't pass, you won't be able to get the key to the virtual world." ”

That's the first puzzle, and it doesn't seem that difficult. However, Lu Yunqian knows her brother's routine very well, and the answer to this problem is the content of the second puzzle, and the second question is definitely more difficult than the first one. She stood at the door of the Internet café and looked at the crowd coming and going, thinking that since her brother said that something was hidden here, then the answer to this question should be related to this Internet café, so she began to analyze the meaning of the puzzle.

Lu Daoheng looked at his sister with a smile on the corner of his mouth, thinking that she looked very cute when she was thinking quietly, and at the same time was more careful to protect her from being touched by people walking by. The brother and sister were contemplative and contemplative, and at the door of the crowded and noisy Internet café, it seemed that only the two of them were left, undisturbed by the outside.

- If you don't pass, you won't be able to get the key to the virtual world.

This is an Internet café, so the virtual world in the title must refer to the game world. The key to the game world...... It's the account password!

It's so simple!

Lu Yunqian's eyes immediately lit up when she thought of this, although she didn't know what the next step would be after getting the answer to the account password, and how to find clues about the gift, she still jumped up excitedly and shouted at her brother: "I know, the answer to this puzzle is your account password, right?" ”

"That's not right." Lu Daoheng had long thought that she would definitely take her game account as the answer first, so he shook his head proudly at the moment, and continued to look at her expectantly, "Think about it again!" ”

“…… Isn't it? Lu Yunqian's excited expression turned into loss before it bloomed for two seconds, she pursed her lips tightly to suppress this emotion, and glanced at the hotel-like Internet café bar.

Although it was already full of guests on the plane, there was still an endless stream of people at the bar asking about how to apply for a card. After receiving the cards from the waiter, they slowly walked around the first floor, hoping to find a seat that had just disembarked to take over seamlessly. There were also people who strode up to the second floor and went straight to the VIP area, not caring at all about the luxury consumption of twelve yuan an hour.

Looking at this group of people, her eyes focused on the computer cards in their hands, and she immediately understood what she was wrong.

- The key to the virtual world is in the hands of the front desk attendants! If you don't go through them to check in the pass, these people won't be able to enter the virtual world even if they have a game account!

If the answer is correct, then you have to get a card at the bar to get a new lead. But Lu Yunqian's age is not up to the standard of going to an Internet café, my brother must understand this, could it be that he deliberately wants to use an Internet café to mislead himself?

She looked at her brother and found that he was also looking at her, and although she wasn't sure if she guessed correctly, she still said tentatively: "Brother...... Is the answer over there? With that, he pointed to the bar.

"Bingo! The first question is answered correctly, let's go. Lu Daoheng's eyes were full of appreciation, and he took her to the Internet café bar. Before he reached the bar, the uniformed boy inside had already seen him, and immediately took out a black boarding card and respectfully placed it on the countertop.

Lu Daoheng was just about to get it, but his sister next to him took the first step and took the card from the high bar counter on tiptoe, and took it in his hand to observe it carefully.

Prior to this, due to her young age, Lu Yunqian had never seen any other Internet café except for the Internet café at her doorstep, so she didn't know the classification of boarding cards in this Internet café. However, she found that the cards handled by the others were all red, but her brother's one was black, and there was a string of handwritten letters on it. Undoubtedly, this is the second puzzle.

“OPERTIO……”

It was a string of letters, and at first glance it seemed to be an English word, but Lu Yunqian was only in the sixth grade of primary school, and she couldn't recognize many words, so she couldn't help but feel embarrassed again.

She glanced timidly at her brother and noticed that he had a wicked smile on his face, and immediately decided on one thing: this is definitely not an English word!

After all, they have lived together for so long since childhood, and the two are almost inseparable, so Lu Yunqian can capture some information from her brother's smile, which can be regarded as an exclusive skill for her sister. That bad smile just now proved that he must have guessed his mistake before he showed such a smile. And the questions that my brother came up with must not be beyond the scope of her knowledge, most of them come from things that the two of them have experienced or learned together, so the string of English in her hand must not be words, but puzzles that need to be disassembled.

Lu Yunqian looked at the black boarding pass in her hand in a daze, and stared at it for five or six minutes, as if she had never seen such a rare thing, and she could see it in her soul. She recited these letters countless times in her heart, but she couldn't see the slightest clue from them, whether she was reading them upright or backwards, or replacing them with a sentence by transliteration.

"Does the password count the number of circles in this letter?" Lu Yunqian, who couldn't think of other answers, was anxious, and remembered that she had encountered a brain teaser problem before that used the number of laps as the solution method, so she asked her brother.

"It's not." Lu Daoheng replied calmly.

Even though she knew it would be such a reply, she squatted down on the ground in frustration. There was no clue in his head, and his eyes began to turn red, but he still refused to put down the boarding pass. He looked at the eight letters of OPERTIO in anger until his eyes were blindfolded by tears and he could see nothing.