Dual is an arcade game written in BASIC with some ML subroutines for moving it's low resolution graphic bricks around (more on that later). It's a two player only game where each player controls their ship's movement vertically only (a player is on each side of the screen) and firing their lasers. Separating the two players is 4 rows of bricks that need to be shot through. One thing a bit more unique about this (basically) 2 player Bustout game is the scrolling bricks, and in particular how they scroll. the bricks zig zag through the 4 rows vertically; so if bricks in one row are scrolling up, once a brick reaches the top it shifts over to the next row and starts going the opposite direction, giving a zig zag effect across the 4 rows.
Not too bad for a low resolution game, and only needs 16K RAM even on a disk system.
Title: Dual
Author: B. Vanden Bosch
Publisher: T &D issue #8
Released: February 1983
Requires: Color Computer 1,2 or 3, Extended BASIC, 16K RAM, 2 joysticks