Within each group, the teams would play a double round-robin to decide their league position.
The four group winners and the four runners-up contested a first play-off round to decide three promotion slots.
BSC Old Boys win after penalty shoot-out and advance to play-offs.
FC Zug win 4–3 on aggregate and continue to the finals.
FC Le Locle win 4–1 on aggregate and continue to the finals.
FC Le Locle win 4–3 on aggregate and are promoted to 1985–86 Nationalliga B.