I tried viewport also, but when i press “P” the game closes, i don’t know why, the game was running fine before i re open the project and try play it.
There is no hurry and i have a backup, but it would be sad to loose some work because the Blender file would not be usable.
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Did you checked the game stop button ? It seted to ESC by default but you might changed it 
I removed some high res textures and got it working again wihtout closing on start.
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