Duke Nukem 3D - Platform: XBox 360

Easier final Boss:
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If you have a jet pack, fly up and destroy the beer blimp. Guns and health will 
scatter on the ground, allowing the final Boss to be killed easier. Note: One of 
the best weapons to use against it is the Devastater.

Tier Drops level in Shrapnel City:
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There is a tenth level in Shrapnel City called Tier Drops. To get there, go to 
the movie level, and go to the stage with the NASA sign and the body parts with 
a telescope. Kill the alien with the chain gun, and press [Use] on the sign. A 
door should appear with the caution sign that ends the level. Note: Do not go to 
the stage with the ship or this will not work.

Secret level in Shrapnel City:
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Go to the Hotel Hell level, then go to the fountain by the pool. Step through 
the waterfall, then go behind a bush. You will see a radioactive waste sign like 
the ones that mark the end of a level, except it is gray. It will take you to 
the secret Freeway level.

Achievements:
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Accomplish the indicated achievement to get the corresponding number of 
Gamerscore points:

Piece of Cake (25 points): Complete "L.A. Meltdown" on any difficulty or in co-op
Let's Rock (25 points): Complete "Lunar Apocalypse" on any difficulty or in co-op
Come Get Some (25 points): Complete "Shrapnel City" on any difficulty or in co-op
Game Over (25 points): Complete "The Birth" on any difficulty or in co-op
Duke's Mighty Foot (10 points): Step on 40 enemies after using the Shrinker on them
Looks Like Cleanup on Aisle 4 (10 points): Step in a pile of excrement. 
Shake It Baby (10 points): Tip an exotic dancer. 
Oomph, Uugh, Where is it? (10 points): Find 70 secret areas. 
Alien Maggots are Gonna Pay (10 points): Finish the "Hollywood Holocaust" level
Gonna Rip Em' a New One (10 points): Get 100 total kills in ranked Dukematch games
See You in Hell (15 points): Get 250 total kills in ranked Dukematch games
Hail to the King, Baby (25 points): Earn respect and get 500 total kills