I couldn’t verify a single definitive skybox for JJS from the available public info, but the most relevant result is a JJS custom skybox tutorial rather than an official preset.

What the public results show

  • A recent tutorial specifically about JJS says there are two ways to change the skybox, and the creator prefers the second method.
  • Another JJS tutorial shows a DIY custom skybox approach using in-game parts and colored neon materials, which suggests many players are making their own rather than using one fixed skybox.
  • Roblox’s official docs confirm that a skybox is just six images used to build the background in an experience, so JJS can use any custom set that the creator configured.

Practical answer

So, the safest answer is: JJS does not appear to have one universally confirmed skybox; it likely uses a custom skybox set, and different tutorials show different setups.

TL;DR

  • No public source here confirms one exact JJS skybox.
  • The game supports custom skyboxes through Roblox’s Sky object system.
  • The “best guess” is that JJS uses a creator-made custom skybox, not a standard Roblox default.

What I can do next is help identify the exact skybox style from a screenshot if you have one.