Duke it out in D.C. is a classic FPS shooter where you play as Duke that must rescue President Bill Clinton from the aliens in this third party expansion for Duke Nukem 3D. How to Play: How to Play:Use your Mouse to Aim. HOLD the Scroll bar down to move forward. Z: Couch A: Jump 1,2,3,4,5,6,7 switch weapons if you have them. Toggle “I” to turn on gun Crossfire.