Gigantic levels, and on each one you may need to collect inventory items to complete: for example, a special glove opens doors, and hooks allow you to walk on tenacious ceilings with your hands.
I hope you know that this game can be legally purchased on the Zoom Platform. They received the special right to sell the game before GearBox bought the Duke Nukem trademark and demanded that DN I, II and MP be removed from Steam and GOG. The Zoom Platform cannot be reached.
5.5