This page is for the original release. For the Megaton Edition, see Duke Nukem 3D: Megaton Edition. For World Tour, see Duke Nukem 3D: 20th Anniversary World Tour.
All patches for the retail version can be found here. An old semi-official patch for OS X (PowerPC only) can also be found here. Digital distribution versions are already patched.
bMouse is a DOS extension which improves mouse looking by removing an engine limitation which would force to use one mouse axis at a time to aim.
Open the console (~) and enter r_pr_fov # with the angle to use.