Oxford United and Bristol Rovers have earned promotion to League One on the final day of the season after winning their respective games, while Accrington Stanley had to make do with a playoff berth courtesy of a goalless draw against Stevenage.
Cheyenne Dunkley's glancing header from Chris Maguire's corner gave Oxford, who ultimately finished second in League Two, the lead early in the second half against Wycombe Wanderers.
Chris Maguire added a second from the penalty spot after Kemar Roofe was brought down in the area by Chairboys defender Aaron Pierre, before Callum O'Dowda sealed the win late on with a shot from inside the box.
As for Rovers, Lee Brown struck their winner in stoppage time as they came from behind to win against relegated Dagenham & Redbridge.
Darrell Clarke's side, who were relegated to the National League on the final day of the season in 2014, have now secured back-to-back promotions to take their place in the third tier.
Oxford, meanwhile, will play in the third division for the first time since 2000-01 next season.