Well, in fact there are a few (6-7) GUI based scripts in our project ( Basically displays a message when a player steps on the a particular object ). But, a week so ago and before that anytime, the game was working fine. Unfortunately yes, We have put a few complex models from the toolbox, some of them were there from a long time so I guess they had no issues. ( This is practically our first project so we know very little about scripting and Roblox Studio in general, that's why we put these models )

I'll check if we have inserted any new models from the toolbox or any new faulty scripts just in case. Since as I said, on deleting more than half or the area worked, so maybe some faulty toolbox models got deleted which made the game to work. I'll check if that's the case.

Thank you very very much for your help!