Why my mesh is dark when i put then inside the game?

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:bust_in_silhouette: Asked By CosmicRat

I was following a youtube tutorial of a tiled dungeon, and i made mesh library with some modeling in blender, but for some reason when i put the a mesh inside the game it’s really dark.
In the preview it seems completely fine :confused:

src of the video: https://www.youtube.com/watch?v=VjuyfBaryu8

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