How do i sum the rows' value of a table?

iTopGames

I am keeping level's scores in a table, i got a row for every level but how do i sum all that values to have the game's general Score?

BrackAttack

Is there a way to write it so that it sums all of row 1 for all future columns added later? I want to restrict a game attribute that sums all of table 1, row 1, for all columns now and forever after.