Like uncovering a spiral-bound notebook full of junior high poetry, Duke Nukem 3D (1996) is back once again to remind you of what passed for “edgy” in the late 90s. After a half-dozen repackaged versions over the past few years, a sizable anniversary is enough for Gearbox Software, the current stewards of 3D Realm’s 1996 FPS “classic,” to give everyone another chance to re-purchase it. Including a brand-spanking new lighting system and a fifth episode created by the game’s original level designers, Duke Nukem 3D: 20th Anniversary World Tour manages to play the way you remember the game and thankfully…