After you draft letters, wait for the Big Game to finish.
That was fun! Now, you receive points if players whose last names contain the letters you drafted scored points in the game.
How many points? For each letter you drafted, you receive this many
points:
Letter occurences in last name
X Points player scored in the game
X Letter Value !
So to win at Big Game Letterbox, when you are drafting letters, try to pick letters that are of high value and are in the last names of players that are on the team that you think will score a lot of points during the Big Game.