SELECT S.hacker_id, H.name FROM Submissions S
JOIN Challenges C on C.challenge_id = S.challenge_id 
JOIN Difficulty D on D.difficulty_level = C.difficulty_level
JOIN Hackers H on H.hacker_id = S.hacker_id
WHERE D.difficulty_level = C.difficulty_level AND D.score = S.score
GROUP BY S.hacker_id, H.name
HAVING COUNT(S.hacker_id) > 1
ORDER BY COUNT(S.hacker_id) DESC, S.hacker_id ASC