mental game is one of the games that is played according to man's mind and focalization, as it's named.
i'm on the mantle games we can point to a completely different game named "Brain Rings"; produced by R.B.T developing team.
The R.B.T team examined the effects of the Brain Rings game by doing researches containing the age of 4 to the age of 60.
and they found out because of the game's unique formula, It has a great effect on memory function welfare and other skills of the brain.
So after the examination, they put this game for public as a useful intertain ment and online competition.