The first three games in the series were 2D and used isometric sprites to give the illusion of 3D depth since real-time 3D polygon rendering wasn't possible at the time.
The series made the jump to real-time 3D graphics with the release of Soviet Strike which used a brand new engine built for fifth generation gaming consoles.
This is because the objectives of later missions are usually protected by a "Danger Zone" which gives enemies in the area increased weapon range, firepower and damage as well as additional armor.
A "Danger Zone" can be removed by the destruction of a radar or power plant, often the objective of an earlier mission.
However, in contrast, the games often displayed a quirky sense of humor, featuring numerous appearances by Elvis including outside a castle where he cannot be killed or even harmed, he just laughs at you and even Santa Claus, as well as wisecracks from the player character in the earlier games (in Urban Strike, the player's character, on being told the villain is an evil genius, comments: 'Great, another evil genius.
A Sega CD compilation called Super Strike Trilogy was demonstrated at the 1995 Electronic Entertainment Expo, but never released.
[citation needed] These list EA as the company filing for them but provide no additional information of substance or interest.