3 rounds seems like a nice option to have

client/src/components/util/GameCreationForm.jsx

@@ -62,6 +62,7 @@ export default ({ afterCreate }) => {
         <Dropdown
           options={{
             "1 Round": 1,
+            "3 Rounds": 3,
             "5 Rounds": 5,
             "10 Rounds": 10,
           }}