I don't know how to properly test this but is it possible that you could shoot the npc as soon as you get the rifle, as long as you aim perfectly (through a ridiculous amount of walls and 100s of meters)? I don't know if walls actually stop bullets at all in this game. Could be worth testing, because it may be possible to shoot npcs you need to kill much earlier in the missions than when you can see them. Or maybe there's a limit to it, I don't know. But the bullet in the video above passes through a floor and a door.

In the options menu you can change difficulty settings. Not just Easy/normal/hard but also Enemy reinforcement frequency, limiting enemy reinforcements, as well as AI Sound detection, AI Sight distance, AI shooting reaction time and AI shooting accuracy. I think some rules about all this need to be defined and put in the rules section of the game.

I assume that the settings should be the default, but there's no way to reset to default. I assume then it would be "normal" on everything and "limit the enemy reinforcements" should be checked?

Should a run include evidence of these settings at the start of the run? Or can you just change them to whatever you want?