system
Given the following post, respond as if you're commenting on Reddit:
human
Can I use a copyright product without a license in a program?

I want to create a "game" more like a build program in which you can build with Lego bricks. I obviously don't have a license for them, but I also don't want to make it monetized or put ads in it. Is it okay to do so or can I get in trouble if I put it out for download?
gpt
Why not just call it "Brick Builder" rather than "Lego"?

Even if you don't make money on it, you can't create a work and represent it as an official work of another person or company. You may be small and obscure enough to fly under the radar but it's still not something you can do.

As an example, Nintendo recently sent a C&D to the creator of a free online porn game involving Mario and Peach. It may be free but you still can't do that.