Use Roblox studio, it's basically a game engine to develop games for Roblox, uses Lua and has a marketplace full of things like 3D models, it's best to start with a simple platformer, Roblox has tutorials on their site.

Before that if it's too much, they could make things like shirts to wear in game and sell those to other players, easiest is to use a template and something akin to photoshop.

Roblox is closer to a game marketplace where the games are made by fans than a game unto itself, so the creativity isn't game inherent unless it's subgame was built to be like that (most aren't).

Don't forget the biggest selling point..you could become some kid's unsung hero by making a game that he plays all the time.

If they're enjoying it, and do so regularly, are they really playing it wrong?

What’s the typical age at which we expect people to decide if they’re doing something for fun - or if they’re doing something to create? Does it matter if it’s inside the sandbox (e.g. SimCity) or outside the sandbox (e.g. Dreamweaver)? What if the sandbox is also a tool for exploitation of the user (i.e. microtransactions?)

To share my own example - beyond SimCity and not-really-understanding-how-to-make-Age-of-Empires-maps when I was 10 years old - I don’t think I can say I was really using computers constructively until I was 12/13 when I was at the point where I actually understood what I was doing with my cracked copies of Macromedia and Adobe software - so if I’m using myself as a benchmark I wouldn’t stress too much about grade-school kids being newbs…

…just please don’t repress them. And introduce them to the concept of creating their own things outside of closed platforms.

How do you distinguish between creating and honing a skill? Some of the best engineers I know were top-level video game players in their youth. Video games taught them how to get really good at something.

Very similar parallels myself. From living on Simtropolis, go struggling to make custom maps for Halo CE on PC, on to making texture modifications with cracked Photoshop 7.0.

Then around 12 I became way more social online, started making custom skins for InvisionFree message boards and spending more and more time in the CSS Zen Garden... and the rest is history!

Like playing with LEGO: building following instructions vs building your own thing. Is it wrong following instructions?

Maybe get them to play more creative games like Build a Boat. The platform is great but like any platform there are games which either do or don’t engage creativity.

Another thing you could try is get an account and play along with them. A lot of games allow for private servers / areas where you can play.

Get them to add real friends from their school and hookup on a web conferencing app. That really helps with team building and communication.

Roblox games can be incredibly creative, many are sims and builders, i.e. games within games. But yeah, Roblox Studio is where the real stuff gets made

And many are not and most are fake creative (making pretention of being creative but not being such if you look close and play).

As a whole, they are no more creative then any other games. And they are rarely if ever as detailed as something like Minecraft.