The following changes to standard ORC were implemented in In Dark Alleys:
- SPD is approximately equal to MPH, so a PC can run approximately .75 ft. per combat round per SPD. In metric: a PC can run 1.5 kmph per PD, or 1/4 m. per combat round per SPD.
- One combat round is about one half second.
- Area attack is rolled as INL + ROF + 1d20 vs. 10 + size of area in ft. (or +3 per m.).