Duck mode has you navigating the same levels with the same controls, with one exception - you have no gun, and therefore you can't shoot. Suddenly the whole point of the game shifts, becoming an exercise in timing between opponent's shots rather than positioning yourself for your own shooting. I'm not sure I'll go through the whole game again, but it's a great idea for an unlockable.
Gunman Clive: Completed!
Duck mode has you navigating the same levels with the same controls, with one exception - you have no gun, and therefore you can't shoot. Suddenly the whole point of the game shifts, becoming an exercise in timing between opponent's shots rather than positioning yourself for your own shooting. I'm not sure I'll go through the whole game again, but it's a great idea for an unlockable.