Raptor: Call of the Shadows is a 2D vertical-scroller single player game for the x86 PC originally written for MS-DOS, by Cygnus Studios. As in all shoot 'em up games, enemies must be shot and destroyed. While flying enemies are the most numerous, many ground targets (buildings, vehicles, turrets) can be destroyed as well. Bosses appear at the end of each wave or even halfway through the later, more difficult waves. The game is divided into three "sectors": Bravo Sector, Tango Sector, and Outer Regions, all of which have nine sub-missions called "waves", making for a total of 27 levels (9 per sector). The full version of Raptor allows players to start out in any of the three campaigns, though playing them in order helps the player to more easily accumulate money for weapon and shield upgrades.