Duke Nukem 3D: 20th Anniversary World Tour

NOTE: This will not unlock on the “Piece of Cake” or “Let’s Rock” difficulties.

The Firefly Trooper is a new enemy in Episode 5. You can unlock this on the level ‘High Times’ on the “Come Get Some” difficulty. When the level starts, activate the cheat menu. Select ‘Give All’ and turn ‘God Mode’ on.

Walk straight across the bridge and turn right. Up on your left is the “Little Green Man Coffee Shop.” Use the blue key card to enter. At the back of the room is the VIP room. Use the yellow key card to gain access to it. When you open the door there will be three Enforcers. Once you kill them, standing on the table in the center of the room is an alien hookah. Walk up to it and press (unlocking “I Never Inhaled”) and the room will turn green/yellow and rotate. Exit through the new door opposite from where you came in.

In the next room, there is a locked door in front of you. Turn right and go into another room, and overlooking a window there will be a switch on the desk that opens the door to the courtyard. Flip the switch and walk into the courtyard and you will see a big fountain in front of you with “Detour” arrows. Follow the signs around the fountain and when you’ve gone completely around, the scenery will change. Where you came out is now a brick wall and two Firefly Troopers will spawn.

Switch to the RPG or Devastator and avoid the enemies as they shoot flames at you. Stay far enough away from them and they will eventually shrink and try to relocate. Keep your weapon aimed at them and when you see them shrinking (they’re quick), keep firing your weapon and if you kill one, the achievement will unlock.