JJ Hooper's second-half hat-trick handed Grimsby a comfortable victory at Forest Green on the final day of the League Two season.
Hooper broke the deadlock on 51 minutes when he stretched to touch the ball over the line.
He grabbed his second on 83 minutes with a sumptuous angled strike and six minutes later completed his treble with a powerful finish from 25 yards.
Grimsby, who have gone unbeaten in their final five games of the season, finish the season in 18th place while Forest Green have ended up 21st in the table.
Forest Green created the better first-half chances but found Grimsby keeper James McKeown in fine form as he denied 25-goal striker Christian Doidge, a Scott Laird free-kick and a Charlie Cooper header.
Referee Seb Stockbridge hobbled off to be replaced by fourth official Adam Bromley with 20 minutes to go.
Report supplied by the Press Association.