6 - Head on 2
Platform:
Arcade
Released on Dec 31st 1979
8 - Safari
Platform:
Arcade
Released on Sep 01st 1977
12 - Fortress
Platform:
Arcade
Released on Mar 01st 1979
15 - Carnival
Released on Jun 01st 1980
19 - Carnival
Platform:
Atari 2600
Released on Dec 31st 1982