M1A1 Fixes is a plugin that makes the scenario a little closer to the original Marathon.
This first version has 3 fixes:
Remove the "Pathways into Darkness" opening
Restore the BoBs' soft-death sequences
Limit the player to a single fist (sadly not the left one)
The "No PiD" plugin is not necessary or compatible with this plugin, so please uninstall or disable it before trying M1A1 Fixes.
Restoring Marathon, one pixel at a time.
...but truely, the thing i miss the most from the original m1 is the old platform sound.