Same game but different article.

Can we write an article about a game for which an article is already written?

I noticed there are games on GameHag having several articles connected with them, both in gereral and in particular (like describing the in-game items, or comparing games with others, etc.)

Just a screenshot of a popular game and its related articles here for example:
http://prntscr.com/tc6hkx

So, maybe, it's legal?..

I have seen many articles related to the same game in Gamehag. But the topic of the articles is different. For example Aion - Review and Aion - Guide. These two articles are on the same game but have a different topic. So, yes it is possible to write an article about the same game but the topic should be new.

i also wrote an article for a same game but it was rejected by the moderators for plagrism.

Yes, you can, but the topic must be different.