Nova Pinball is a 1-4 player version of Pinball, somewhat similiar in features to Tandy's Radio Ball. While there is no multiple balls in play (that I know of), there are ball blockers, bonus counters and the like. However, the physics seem to be a bit rigid - since there appears to be no pressure on the ball plunger (except full blast or none), a ball always starts with the exact same path.
Title: Nova Pinball
Author: ???
Publisher: Bumblebee Software.
Released: November 1982
Requires: Color Computer 1,2,3, 16K RAM tape or disk.