3 and 37 - agree with Tiny
Arran / tiny:
3 - If you are getting O instead of X, can you confirm that each of your columns have 3 X's + 3 O's and that each of your rows have 5 X's + 5 O's?
37 - I get OPTED because my responses are Over / Pairs / Trial / Extreme / Darts. What type of "poker hands" start with U?