Three Letter Words Starting With S

I think putting the answers in random order may have the opposite effect from what you intended. It means the user has to find some other way to keep track of what he has already guessed, and the easiest way to do that is to make his guesses in alphabetical order. That naturally leads to random guessing (saa, sab, sac, sad, . . .), and there's enough time to go through all the sa_, se_, si_, so_, and su_ combinations and then double back and do s_vowel words to catch everything else (with 1:52 to spare).