Lincoln gained promotion to the Sky Bet Championship for the first time since 1961 thanks to a hard-earned 2-1 victory over League One playoff chasers Reading.
Needing just a point to return to the second tier for the first time in 65 years, Lincoln made a bright start and took the lead only in the fifth minute thanks to Ryan One.
Reading equalized in the second minute of added time late on, with a Lewis Wing free kick, but Jack Moylan snatched the winning goal four minutes later.
Harry Leonard's equalizer earned him a share of the spoils from Peterborough's 1-1 draw against second-placed Cardiff, who dropped even more points in the promotion race.
Leonard immediately canceled out Alex Robertson's opener for the Bluebirds as their wobble extended to just two wins in eight games, with the gap between them and third, now occupied by Bradford, reduced to seven points.
Bradford came from behind to beat Wycombe 2-1 at Adams Park, and Aden Baldwin's second half gave their play-off hopes a big boost after Bobby Pointon canceled out Andre Vidigal's opener for Wycombe, who dropped to 11th.
Bolton and Stockport were neutralized with a 2-2 draw that effectively ended both teams' hopes of securing automatic promotion, Ben Osborn's own goal giving the home team a point.
Stevenage returned to the play-off places with a 1-0 home win against Blackpool, Harvey White firing the winner in the 66th minute to boost promotion hopes, although seventh-place Plymouth's 3-0 win at Barnsley kept the pressure on.
Luton kept their play-off hopes alive with a 3-0 win at AFC Wimbledon, Burton picked up a precious point in their battle for survival in a goalless draw at Mansfield, and Wigan took a significant step towards survival with a 3-1 win over Northampton at Sixfields.
Exeter ended a 15-game winless streak to give a boost to their hopes of avoiding relegation with a 3-0 thrashing of Doncaster, while Leyton Orient lost 2-1 at home to Huddersfield.
In League Two, MK Dons were unable to take advantage of leaders Barrow not playing as they drew 1-1 at Oldham, Mike Fondop with a late goal to deny Dons after Marvin Ekpiteta's opener.
Lucas Ness headed in the first two goals of his career to lift Notts County into the top three after a 3-1 win over relegation-threatened Newport County at Meadow Lane, while Cheltenham put a dent in Cambridge's automatic promotion hopes after Jake Eastwood scored an own goal in added time in a 1-1 draw.
Late goals from Fletcher Holman and Aaron Drinan saw Swindon come from behind to beat Walsall 2-1, Salford's automatic Play-off hopes were dented as they lost 1-0 at Crewe, while Chesterfield won 1-0 at Barrow.
First-half goals from Jaze Kabia and Harvey Rodgers boosted Grimsby's play-off bid with a 2-0 win at 10-man Crawley, Gillingham won 2-0 against Accrington and Ellis Harrison scored twice as Bristol Rovers beat Harrogate 3-2.
Barnet moved to within four points of the play-off places with a 5-2 win over Fleetwood, Grimsby won 2-0 at Crawley and Tranmere lost 1-0 at home to Colchester.
