I've made my first game, in Unity, and I want to upload it to MediaFire.
I'm not sure what to upload. Should I upload the whole project, or is a certain part enough for someone to play it?
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If you wish to upload your game for others to play, you should only have to upload the build. This is the executable that is created when you build your project.
In contrast, you should only upload your entire project if you intend for users to have access to your Unity project.
For further direction, follow this YouTube tutorial.