Back to MH2006
It is the game where players make lists of as many words as they can make from a group of letters, but don't get points for the words that other players also list (thus the crossed-off ones).
From the lists, here are 16 (same as the title!) letters needed to make those lists:
RESONATESTPAWSIO
Notice that "ANSWER IS" can be made with these letters, leaving "POTATOES".