Subway Scrabble game?

Question

do you have to spell the whole word or just the 2 or 3 letters it gives?

Answer 1

I think you have to fill in the missing letters on their board. So they have some of the letters already on there, and you fill in the blanks with the letters you get. So far I only have I and R. I need to eat a lot more subs!!!

I am bummed, b/c I went to subway and specifically got the big drink b/c it supposedly came with extra scrab plays, but my cup had no extra plays. They jipped me.  

Answer 2

the entire word (unfortunately)

Answer 3

According to the website "SubwayFreshBuzz", all it takes is a few lucky letters to win.