The backdrop will tell you what letter to pick. Press the letter. At the end the letter's will tell you your score on each Num Num, and which ever got the most means you would be that Num Num! (It tells you what letter is who at the end)
Who did you get? I completley made this without watching anything to help me, so if there are any glitches/bugs PLEASE comment below! Who is your favorite Num Num?