Congratulations
https://blenderartists.org/forum/showthread.php?237623-How-to-lock-the-Camera-Rotation&p=1993599&viewfull=1#post1993599 “How to lock the Camera rotation ?”, thread started by Midgardh, is the 300. entry.
Good luck
Can i request build system in blender??? 
it will be awesome
Hello Hanprogramer.
I don’t know nothing about ‘Build systems’ and Blender.
I found this article: https://www.gamedev.net/forums/topic/407365-build-systems-and-blender/ from 2006.
I think it’s better you post a thread in the ‘Blender and CG Discussions’ Forum to ask there about it.
Greetings
achisp
Hello Hanprogramer.
If I misunderstood your question and you wanted to ask if you can send me a link to a tutorial about ‘build systems in Blender’, instead of asking me if I would search about it and then put it in the ‘Free text tutorial Index’, my answer is: please read the first part of post#1 of this thread https://blenderartists.org/forum/showthread.php?414496-Requests-for-the-Free-BGE-text-tutorial-index&p=3143688&viewfull=1#post3143688 , than you should know if I would put it in or not.
In short: It have to be a link to a free text tutorial in english related with the use of the BGE for game development.
Greetings