Hello again, I am sorry for a second suggestion but...
I would like to suggest a Xianxia/Wuxia tag since it would be suggested sometime anyway. It is considered a tag by most of the readers already and the number of such comics rises by day.
I would like to see a "Game" tag because of the many mangas which are level based. Even though not all level based mangas are about games I wouldn't know how to name it otherwise than "Game"... Maybe just "Level" or something like that.