10. Moon: The first DS fps to not suck!

9. Hovertank 3D: a very early example of what was to come of FPS

8. Heretic: The first FPS to let you look up and down.

7. Hexen: One of the first FPS to let you use a inventory system.

6. System Shock: The first RPG FPS

5. Half life: The first FPS to show how cinematic an FPS could be.

4. Quake: The first FPS with completley online multiplayer and fully 3D graphics.

3. Duke Nukem 3D: The first FPS with a real character,sexuality,and a free looking camera. And "Balls of steel"

2. DOOM: The first FPS to make realistic polygonal shapes and great lighting and shading.

1. WOLFENSTEIN 3D: The first first person shooter.