system
Given the following post, respond as if you're commenting on Reddit:
human
[Dragon Ball] How the hell did Cell build such a nice arena for the Cell Games?

I realize he probably just blasted some rock out of a mountain, but it looks so pristine. It's like master craftsmanship. Tiled floors, pillars, and everything.

edit: thanks or all the replies. I'm not an avid watcher so I'd assumed it just happened offscreen.
gpt
So there seems to be a few types of power in dragon ball, ki which is sort of everyone's bread and butter, but there is also magic and psionic power as well. Since cell is sort of an amalgam it makes sense that he would have the ability to use magic and psionic power as well. So he used a combination of essentially telekinesis and magic to build a sweet arena.