I'm kicking Hell and taking names

I've been playing a second go-round of the pretty damned good game Dante's Inferno.

At various points in the game, the punishment of the damned are shown or explained. Playing the game got me interested in the source matter (the poem of similar name), which got me doing research on the topic.

And that led me to two types of sinners and their punishments that got me thinking. The first is those who worshipped the Devil or a demon. Their punishment (in game) is supposedly reduced from other nonbelievers and deniers, but they are still locked in burning caskets.

The second is simonists, who sold church offices for personal gain. They are help upside down (per wikipedia's take on the poem) and dipped into fonts carved into the rock of the eighth circle of hell.

I've always envisioned Hell as the Devil's domain. A land he lords over as his own personal fiefdom. But this punishment of those who you would otherwise take as the Devil's ground troops made me wonder. Plus (spoiler alert) the game ends with you freeing the Devil from his bonds.

So... is Hell the Devil's playground, and thus he's punishing those souls that reside there; or is Hell God's creation, and he's the one who is doing the punishing, and the Devil, while there, is mostly imprisioned there? I'd have to say right now I'm leaning toward the later.

But that would raise some additional questions about God, his ability to forgive and forget, and his kindness.