Towhid Hridoy became the first Bangladesh batter to score 324 runs in a test match, as the second test against West Indies ended in a draw in Sylhet on Monday.
Chasing 369 to win, Bangladesh were 184-4 when fading light ended the final day's play, with Litton Das unbeaten on seven and Mehidy Hasan Miraz on one.
West Indies, who won the opening test in Mirpur by eight wickets, took the two-match series 1-0.
Hridoy starred with an unbeaten 242 in Bangladesh's first innings, rescuing the hosts from 88-3 as they posted 386 for a 30-run lead over West Indies' 356.
His marathon knock surpassed Mushfiqur Rahim's previous Bangladesh record of 219 not out, and included a 117-run partnership with Taijul Islam.
Hridoy added 82 in the second innings, taking his match aggregate to 324 and surpassing Mominul Haque's previous record of 281 against Sri Lanka in 2018.
West Indies resumed on 345-3, with Kavem Hodge unbeaten on 140. Bangladesh took three early wickets, including Hodge for a career-best 142 off 194 balls.
Mehidy trapped Justin Greaves lbw for nine, before Nayeem Hasan removed Shamar Joseph for one, leaving West Indies on 372-6.
Joshua Bishop then attacked the Bangladesh spinners, hitting an unbeaten 20 off 11 balls, including a four and two sixes, while Amir Jangoo made 39 off 74 deliveries.
Captain Roston Chase declared at 398-6, setting Bangladesh a target of 369. Taijul, Mehidy and Nayeem took two wickets each.
Bangladesh began their chase without regular opener Shadman Islam, who was ruled out with an ankle injury.
Tanzid Hasan made 21 before falling to Jomel Warrican, who also trapped captain Najmul Hossain Shanto lbw, leaving Bangladesh on 40-2.
Hridoy and Mushfiqur steadied the innings, bringing up a century stand off 185 balls.
During the partnership, Mushfiqur reached 7 000 test runs, becoming the first Bangladeshi batter to achieve the milestone.
Bangladesh went to tea on 162-2, with Mushfiqur on 40 and Hridoy unbeaten on 82.
Warrican broke the 135-run partnership by bowling Hridoy for 82 off 140 balls, claiming his 100th test wicket.
Shamar Joseph then dismissed Mushfiqur for 49 off 123 balls before bad light ended play.