Roger traveled to the world of Harry Potter.

The game started on hellish difficulty; he became the apprentice of an old, powerful, and extremely temperamental dark wizard. Just as he was cautiously serving this unpredictable mentor, he unexpectedly discovered that the bio-computer he had developed in his previous life had also transmigrated with him!

From then on, Roger's magical training began with the three Unforgivable Curses! "Analysis of the Imperius Curse complete." "Begin observing Professor Quirrell."

Years later, when the Daily Prophet was preparing to write a legendary feature on Mr. Roger Lewis, prominent figures in the wizarding world spoke out:

Professor McGonagall (with a serious expression of amazement): "Without a doubt, Mr. Lewis is an unprecedentedly outstanding graduate in the history of Hogwarts." Dumbledore (his wisdom gleaming behind his half-moon spectacles): "I must admit that no one understood the nature of magic better than Roger. Not even the four founders of Hogwarts." Voldemort (in a complex tone): "It is well known that I made indelible contributions to Roger's magical research..."

Rita Skeeter (writing furiously with her quill pen, her eyes gleaming with gossip): "Mr. Riddle, was it the summer before Mr. Lewis enrolled?"

Voldemort (lost in memories): "Sigh...that summer, they invited me to participate in the experiment, though the method was crude...If they had said it was to develop an elixir of immortality, I could have provided tremendous assistance! I wouldn't have needed to go through the trouble of finding the Philosopher's Stone...I still deeply regret missing this opportunity to return sooner!"

After accidentally traveling to the world of Harry Potter, and enjoying his second life in the magnificent wizarding world, Maureen, now the owner of a dark magic shop and known as Mr. Burke, has to find a way to get rid of an employee. Although this employee is young, handsome and eloquent, who made him called Tom Riddle...

Words are like silk, weaving the warp and weft of stories; stories are like rivers, settling the pebbles of knowledge; knowledge is like fire, forging the stars of wisdom; and in the folds of time, the ancient light of civilization shines forth.

Forming a bond with a woman will earn you rewards; forming a bond with a noble woman will earn you even more rewards.

Having experienced two consecutive time travels, Li Zhihui finally awakened his system, but he ended up with an unorthodox one.

"So, it's really not that I'm promiscuous, it's just something that can't be helped."

...

Elements: [Extensive use of internet memes] [Highly charismatic paladin] [Semi-invincible build] [Pseudo-D&D setting (primarily based on the game's world view)]

The following worlds have been confirmed: Baldur's Gate, The Witcher, Cyberpunk 2077, and Hogwarts.

In 1991, Harry Potter, who was looking forward to campus life, stood on the platform of the Hogwarts Express, accompanied by his parents, godfather, Uncle Remus and a snow-white owl, and hugged and said goodbye to them one by one. The wind blew his bangs aside, revealing his smooth forehead above his green almond-shaped eyes. He just felt that he was the happiest little wizard in the world. The last person to say goodbye to him was his godfather, Sirius Black. "Harry, remember, have fun!" Black squatted down, his grey eyes sparkling, "If anything happens, you know, just look for Uncle Regulus—" This is a story about a game geek who plays "Assassin's Creed" and travels through time to the story of Regulus Black, a relative of Harry Potter. Regulus is responsible for hard work, and others are responsible for happiness! Protagonist: All..

Matthew traveled to "Harry Potter", only to find that the world was facing the invasion of various foreign evil gods:

The "Dimensional Devil" that rules purgatory, the "Eyes of the Abyss" that dominate the spirit world, the "Paradox Devourer" that occupies the void...

There is also the "Blood Lord" who stole his chance to travel through time and whose strength has undergone a qualitative change...

There are suddenly many evil cults in the world. They are the root of the old beliefs and the anchor point for the invasion of foreign gods.

Fortunately, the system has awakened an incredible wisdom!

Yes, you read that right! The system has given itself a cheat code!

And as the host...Matthew can completely skip the comprehension steps and directly obtain the results of comprehension!

What does your understanding mean to my understanding? We just have different divisions of labor.

Many years later, when many evil gods were willing to burn the world to death in order to descend upon Hogwarts:

[You have come into contact with the origin of the laws of space. Due to your extraordinary understanding, you have gained the right to manage the crystal wall of the world.]

[You watched the world that was about to fall. Due to your extraordinary understanding, you mastered the endless world destruction chain.]

You can figure out the system, and leave Hogwarts to me!

Looking at the system prompt, Matthew announced domineeringly:

Evil God, get out of my Hogwarts!

…

Dumbledore: Wait, your what?

Returning from the mysterious world, witch Harry only wants a peaceful life and to experience Hogwarts, this fairytale playground, firsthand. However, a certain self-proclaimed Dark Lord and some so-called "important figures" seem determined to prevent her from having her way. So, it's time to let the wizarding world know what true "calamity" really is. (Those who haven't read Harry Potter or Lord of Mysteries won't be affected.)

There's a legend circulating around Hogwarts: Miss Lacus's first cry gave birth to the Dementors; Miss Lacus's first nightmare gave birth to the Obscurus; Miss Lacus's first fear gave birth to the Boggart; Miss Lacus's first laugh gave birth to Peeves; and Miss Lacus's light side became Voldemort! "Hogwarts, that's all a lie!" Miss Lacus protests. "Your light has no dark, heavy secrets, only light and bright!" (A playful Hogwarts fanfiction, featuring many meme elements and some Hogwarts Legacy content. The protagonist is a lone wolf, not for women.)

[Gender-Changing Cookie] [Multi-Purpose Tent] [Bamboo Dragonfly] [Adaptation Lamp] Lynn's four-dimensional garbage bag always manages to unearth many magical secret items, even if they're just a bunch of old stuff, they still bring help and joy. The helpful Lynn arrives at Privet Drive and encounters Harry Potter, who is struggling. To help him ease the strained relationship with his aunt and uncle, he gives Harry a magical cookie that completely changes his life. And when Lynn arrives at the magical Hogwarts School of Witchcraft and Wizardry, what changes will he bring to the magical world? Welcome to—Harry Potter and her best friend Lynn's Hogwarts daily life; Severus Snape's new life after shaving his greasy hair; Voldemort realizing he may have misjudged the object of his prophecy...

Joel Hemis always thought of himself as an ordinary druid. Until he was eleven, when he received a letter delivered by an owl—and from that moment on, he became a proud little magical owl. ...That school year, the Forbidden Forest welcomed a Patronus. By the time all the teachers and students of Hogwarts realized what was happening, they were already surrounded by the Forbidden Forest! Until one day, the mysterious man came knocking—Joel: "Sorry, I just want to plant trees in peace and quiet, I don't want to fight!"... [P.S.: This is a lighthearted story about going to school and happily planting trees...No need to have read the original books.]