This story is great and all, but it isn't complete. Why don't they mention the original, side-scrolling Duke Nukem games for the PC? I'm pretty sure I remember

This story is great and all, but it isn't complete. Why don't they mention the original, side-scrolling Duke Nukem games for the PC? I'm pretty sure I remember owning 2-3 side-scrolling, baddy-shooting Nukem games, and they were equally as awesome.