Quatris Pro Ver. 2.0 - Math Edition © 1990 Citadel Corp.
PD/Sharware version of the game containing 3 levels.
Winner of the 1990 Rockwell International Computer Science Competition (LAUSD).
The game was actually used to help the rehabilitation of brain-injured patients.
The registration fee was $15.95. Source codes of the game in Turbo Pascal 5.5 were also available for additional $39.95.