It simply could pre-selected missions like Laser Squad was.Since controlls and mechanics are the same, it needs just to add “switch turn to player 2”+
It had a heavy 3D engine upgrade - g a modified version of the engine used in Magic Carpet. It was released for Playstation, Sega Saturn and DOS - Sadly, no Amiga version.
Sattelite Reign is a definite Syndicate style continuation, unlike Syndicate FPS.