Red Zone is a rather unusual game for the
Sega Mega Drive developed rather late in the machine's life cycle by demo-scene veterans
Zyrinx. The game is comprised of two modes: the first is a top-down
helicopter sim (with gameplay similar to
Desert Strike, except now with rotating 3D graphics and a seemingly
gouraud-shaded landscape), the second is a top-down shooter in the style of
Gauntlet (which comes into play when you land the helicopter and enter buildings).
Both sections of the game utilised cunning effects that gave the impression of polygonal 'depth'. Another technical achievement of the game was the use of cleverly compressed FMV (used in the intro and explosions in the game), similar to the rotoscoped animation in the intro of Another World.
Red Zone is worth checking out on emulator just for the graphical effects, and is quite fun to play (if rather hard going). The game is sometimes referred to as Hard Wired, which was its in-house name during development.