this is part of the solution, nvm

src/Difficulty.cpp

@@ -47,6 +47,31 @@ CourseDifficulty GetNextShownCourseDifficulty( CourseDifficulty cd )
 	return Difficulty_Invalid;
 }
 
+Difficulty OldStyleStringToDifficulty( const RString& sDC )
+{
+	RString s2 = sDC;
+	s2.MakeLower();
+	if( s2 == "beginner" )			return Difficulty_Beginner;
+	else if( s2 == "easy" )		return Difficulty_Easy;
+	else if( s2 == "basic" )		return Difficulty_Easy;
+	else if( s2 == "light" )		return Difficulty_Easy;
+	else if( s2 == "medium" )		return Difficulty_Medium;
+	else if( s2 == "another" )		return Difficulty_Medium;
+	else if( s2 == "trick" )		return Difficulty_Medium;
+	else if( s2 == "standard" )	return Difficulty_Medium;
+	else if( s2 == "difficult")	return Difficulty_Medium;
+	else if( s2 == "hard" )		return Difficulty_Hard;
+	else if( s2 == "ssr" )			return Difficulty_Hard;
+	else if( s2 == "maniac" )		return Difficulty_Hard;
+	else if( s2 == "heavy" )		return Difficulty_Hard;
+	else if( s2 == "smaniac" )		return Difficulty_Challenge;
+	else if( s2 == "challenge" )	return Difficulty_Challenge;
+	else if( s2 == "expert" )		return Difficulty_Challenge;
+	else if( s2 == "oni" )			return Difficulty_Challenge;
+	else if( s2 == "edit" )		return Difficulty_Edit;
+	else							return Difficulty_Invalid;
+}
+
 static ThemeMetric<RString> NAMES("CustomDifficulty","Names");
 
 RString GetCustomDifficulty( StepsType st, Difficulty dc, CourseType ct )