Difference between For all the marbles and Have all one’s marbles

for all the marbles—(coll.) compete for all the money or for the top prize:

• This game is for all the marbles, it all comes down to one game and the team that wants it most will win.

have all one’s marbles—(coll.) be in possession of one’s mental faculties:

• My first teacher will never be gone from my mind as long as I still “have all my marbles.”

Cf.: lose one’s marbles—(coll.) lack one’s mental faculties:

• Not only has Mike lost his common sense, it would appear that he’s lost his marbles as well.