7. Blood (1997)
Publisher: GT Interactive
Blood is an almost criminally overlooked title in the MS-DOS gaming pantheon. Using the same Build game engine as Duke Nukem 3D, Blood, despite its old-school technological base, eclipsed rival Quake in character, design, and gameplay.
The plot, pitting one man against a crazed cult and their evil god, is forgettable; but in control and design, the game feels flawless. Its detailed graphics form a cohesive, horrifying whole, and its vocal and sound effects stand alone in the DOS era. Better yet, Blood has the most creative and varied level design of any DOS first-person shooter, bar none.
Where to get it: Blood is available for purchase and download from GOG.