Simulated Twilight Town

The Simulated Twilight Town, also referred to as the Other Twilight Town, is a datascape that appears in Kingdom Hearts II and makes a brief appearance in Kingdom Hearts 358/2 Days. It is a digital recreation of Twilight Town.

The Simulated Twilight Town was created by Ansem the Wise in an attempt to keep Roxas contained while also throwing off Organization XIII. It is a Data World similar to Radiant Garden's Space Paranoids, and can be entered by similar means. While it is a nigh-perfect recreation of the real Twilight Town, it has some glitches in the form of the Seven Wonders of Twilight Town. Ansem even recreated every resident of the town, using data samples of each person's heart in the real town. Although keeping to their usual attitudes, the residents mostly act under Ansem's influence, though he is unable to completely control them. It is described by Ansem the Wise as being constructed in Sora's memories.

Kingdom Hearts 358/2 Days
After Sora, Donald, and Goofy's journey through Castle Oblivion, Ansem the Wise, operating under the alias "DiZ," convinces Naminé to move the trio to his lab in Twilight Town to protect them from Organization XIII, as the castle was still under their control. However, in order to restore Sora's memories completely, Ansem sends Riku to capture Sora's Nobody, Roxas. Once Riku returns with an unconscious Roxas in tow, Ansem placed Roxas inside the Simulated Twilight Town in order to hide Roxas from the Organization until it was time for Roxas to return to Sora.

Roxas's story
To prevent Roxas from escaping, DiZ altered Roxas's memory with data to make him believe that he was a normal teenage boy who lived in Twilight Town with his best friends Hayner, Pence, and Olette. In spite of that, Roxas begins experiencing strange dreams of Sora's exploits during his first adventure. In the digital Twilight Town, summer vacation is coming to a close, and Roxas and his friends try to have some last-minute fun before returning to school. Unfortunately, his fun is constantly being interrupted by Nobodies and two men in black coats. One of the cloaked men, Axel, was sent into the digital Twilight Town and attempted to persuade Roxas to return to the Organization. When Roxas showed no signs of remembering either his friendship with Axel or his time with the Organization, Axel resorts to violence to bring him back. As time goes on, Roxas begins to regain his memories of the Organization, with the help of the Keyblade and Naminé, who acts as a guiding figure to Roxas.

Everything Roxas knew began to crumble around him, and he could only trust Naminé. On his last day in Twilight Town, Ansem freezes time inside the simulated realm and summons Roxas to the Old Mansion outside of town. When Roxas reaches the Old Mansion, he unlocks its gates using the Keyblade and enters the mysterious building. Roxas encounters Naminé once more in the mansion's White Room, and he starts to regain memories of his former life as a member of Organization XIII. Roxas is eventually able to locate the digital version of DiZ's computer, which he destroys. There, he finally regains his full memory, remembering that he was once a member of Organization XIII, who had used him for his ability to wield the Keyblade, and that he had left it to find his past, only to be captured by Riku.

In the mansion's basement, he faces off against Axel once more and defeats him. Roxas enters the Pod Room in the Old Mansion, where he finds the sleeping Sora, Donald, and Goofy. Roxas decides to become one with his original self, causing Sora to awaken in the true Twilight Town's Old Mansion.

Sora's story
The virtual Twilight Town was first visited by Sora late into his fight against the Organization. He enters the virtual Twilight Town with the help of Hayner, Pence, Olette, and King Mickey. Sora enters a portal left by Axel in the virtual basement of the mansion to access The World That Never Was.

Kingdom Hearts III
After his failed Mark of Mastery exam, Sora returns to Twilight Town with the intention of trying to find a way to help Roxas become his own person. With the help of Hayner, Pence, and Olette, who wish to become friends with Roxas like their counterparts in the virtual Twilight Town were, Sora examines the computer in the old mansion. Pence is able to link the computer to the Hollow Bastion OS in Radiant Garden with the help of Ienzo. Jiminy Cricket theorizes that, as a data world, the Simulated Twilight Town constitutes its own datascape.

Ansem, Seeker of Darkness and Xemnas confront Sora outside the old mansion, claiming his efforts to use the Simulated Twilight Town are futile. While Sora wants to put Roxas's heart inside the virtual Twilight Town so that he can live there, Ansem reminds him that the town is just data.

Using the data of Roxas that Ansem the Wise had encoded into the virtual Twilight Town, Ienzo is able to alter a blank replica and prepare it to house Roxas's heart so that Roxas can have his own body separate from Sora. After the real Organization XIII is defeated, Ienzo, Even, and Ansem the Wise do this again with Naminé's data from the virtual Twilight Town, giving Naminé a replica body as well.

Differences from the real Twilight Town
There are many notable differences between the virtual and real versions of Twilight Town, which include:
 * Yen Sid's Tower only exists in the real Twilight Town. The train to it in the simulated Twilight Town leads nowhere, and is considered a ghost train.
 * Hayner, Pence, and Olette have little knowledge of Roxas's existence in the real Twilight Town (though they feel that they have met Sora, Roxas's original self, even before meeting him), but they are his best friends in the simulated Twilight Town. In Kingdom Hearts 358/2 Days, Roxas and Axel briefly met Pence; later Roxas met Hayner and Olette as well, although they never reached the extent of friendship shown in the simulated Twilight Town.
 * Setzer is the Struggle champion in the simulated Twilight Town. In the real Twilight Town, it is Seifer, though this could be because Seifer beat Setzer in the last competition, taking his place as champion.
 * In the simulated Twilight Town, there is a standalone building with a candy shop. In the real Twilight Town, there is a Moogle Shop instead.
 * Only the item shop is functional in the simulated Twilight Town, but all shops are in the real Twilight Town.
 * Evidently Sora must go to the simulated Twilight Town only once—and he discovers that the computer in the simulated world's Old Mansion's basement is destroyed (by Roxas), while it is in perfect shape in the real Twilight Town.
 * The save points in the basements of the Old Mansion are different—the basement in the simulated Twilight Town uses Type B while the one in the real Twilight Town uses Type A.