Doncaster secured promotion to the Betfred Championship after defeating North Wales Crusaders 18-6.
The Dons opened the scoring inside the first 15 minutes after Mahe Fonua powered his way over to score.
Connor Robinson later in the half added a penalty to give Doncaster a 8-0 advantage at the break.
The second half was just as cagey as the first, however, it was Richard Horne’s side who extend their lead through Loui McConnell after Robinson broke through the defensive line before passing inside.
Crusaders tried to fight back and scored through Toby Hughes with ten minutes remaining to reduce the deficit to 8 points.
Dons’ captain Sam Smeaton sealed promotion with a try inside the final five minutes.