We all know that Sora went to sleep (along with Donald and Goofy) at the ending of Chain of Memories, and back then, i think it was safe to assume that the room in which Sora's pod where he slept was in Castle Oblivion(since obviously, if it wasn't in there, where else would it be? They can't just walk to another world, they need something to transport them there). However, at the end of the prologue of Kingdom Hearts II, it turns out the room which had the Pod that Sora was sleeping in was actually in the Mansion of the Virtual Twilight Town, where Diz happened to be too, thus how Roxas was able to get to it and re-merge with Sora.

 

This doesn't add up, i mean, i'm pretty sure that the room which held Sora's pod was originally in Castle oblivion, yet Sora happened to appear in the Mansion to the Virtual Twilight Town at the end of II's prologue instead. At first i would've said that they might've moved the Pod with Sora, but the weird thing is the room in which Sora's pod is looks exactly the same as it did when it was supposedly in Castle Oblivion. If Namine had taken SDG to another world to put them to sleep, i'm pretty sure there would've been a mention of that, not to mention, the only way to travel across the worlds is by Corridors of Darkness, Keyblade Glider, or Gummi ships. I was then thinking maybe the Virtual Twilight Town was made up of Roxas's memories in Castle Oblivion, but if that was the case, SDG would've had to been shown leaving CO after leaving the Virtual TT, and they weren't. If they were, it probably would've been shown/mentioned. So where exactly was that room which held Sora for a year after he was put to sleep?

First the Mansion in Memory Twilight Town at Castle Oblivion, since Riku sees the pod while he's there in Basement 2- then they transport it to get away from the Organization to the real Twilight Town during 358/2 Days when Naminé and DiZ were standing outside the Mansion. Some time later, deeming it unsafe to keep it in the real Twilight Town, they then hide Sora Donald and Goofy's pods in the Data Twilight Town they will eventually send Roxas to

 

Some time later Days ends and Roxas has his 6 days there, then returns to Sora while Sora's still sleeping, in the Data Twilight Town mind you

 

With Roxas gone, DiZ now transports the pods back to the real Twilight Town before waking Donald and Goofy up by deactivating their pods, leaving them to greet Sora

Edited August 9, 201411 yr by Ruby Rose

First the Mansion in Memory Twilight Town at Castle Oblivion, since Riku sees the pod while he's there in Basement 2- then they transport it to get away from the Organization to the real Twilight Town during 358/2 Days when Naminé and DiZ were standing outside the Mansion. Some time later, deeming it unsafe to keep it in the real Twilight Town, they then hide Sora Donald and Goofy's pods in the Data Twilight Town they will eventually send Roxas toSome time later Days ends and Roxas has his 6 days there, then returns to Sora while Sora's still sleeping, in the Data Twilight Town mind youWith Roxas gone, DiZ now transports the pods back to the real Twilight Town before waking Donald and Goofy up by deactivating their pods, leaving them to greet Sora

umm.... Yeah, did I mention earlier how awesome you are for that?

Ruby basically described it all.