Everything in the scene is black

[brucexiaok]

After I load scene by name or by file, everything in the scene is darkness, It looks like the near/far plane wrong in the scene camera.

Here is my scene view after open level100

[nesrak1]

Those are masks, you can select them and hide them by unchecking the checkbox to the left of the gameobject name textbox in the inspector.

[brucexiaok]

i dont think so ,because the scene opend looks normally by my friend's computer, i think it maybe some settings problem.
here's the same level (level94) opend by my/friend computer

[brucexiaok]

the lighing and detail looks wired from my computer,And I tried another computer, also the same problem

[nesrak1]

Well they are masks in level100 which you can hide. There's a few in your lebel94 screenshots as well. The masks are part of the map, that's not a bug with this project.
In terms of the lighting, the editor has a scene lighting option (the light icon on the top left of the scene window) that may be causing it to look dark.