The final play-style that you are awarded at the end of a level is dependent on the type of actions that you take while playing it. For each of these actions you earn points in one of the three categories, "Ghost", "Opportunist" and "Predator". The pie chart at the end shows the percentages of the points you earned in each category, and you are rated based on which category had a larger percentage.
Ghost
You get points toward Ghost if you make it through the level without being detected, and without killing or performing knockouts . To get 100% you must also leave things more or less how you found them, no putting out lights, etc. Leaving doors open does not directly count against you. However if a NPC sees it opening or finds a door open that shouldn't be it might alert them, resulting in Opportunist points.
Opportunist
Each light that you extinguish gives you a small amount of points toward Opportunist.
Raising suspicions or being detected with give you a moderate amount of Opportunist points.
Predator
Knocking out citizens will earn a large number of points towards Predator.
Killing guards or civilians will get you a very large number of points toward Predator.
Hybrid actions
Knocking out guards will give you a moderate amount of both Opportunist and Predator points.
Strategies for obtaining your desired play-style rating:
Ghost
- Remain undetected
- No kills
- Very few if any knockouts
- Only extinguish lights when you feel it is absolutely necessary
Opportunist
- Don't worry about raising suspicion, but try to not be detected so you can avoid combat and potential killing
- Extinguish lights as much as you want
- No kills
- Use knockouts sparingly
Predator
- Kill, and knockout indiscriminately until your heart is content.
Testing Methodology
The above conclusions are based on experiments I performed by running Chapter 1 a number of times while doing slightly different things. I first did a 100% Ghost run to establish a baseline. Each run after that I did almost the same thing but performed a certain kind of task once (extinguish a light, knockout a guard, kill a guard, etc). I took roughly the same path every time but there were variations, it is possible that what I did or didn't do (more/less stealth actions, etc) may have had a small influence on the final percentages but that variance should not be large. From what I have observed, it should not affect the results; you don't really seem to earn Ghost points, you instead start with 100% Ghost and loose Ghost percent by gaining percentage in the other categories. All tests were performed on "Rogue" difficulty to make things quick and more fool-proof, I don't know if difficulty level can influence the points awarded.
The savegames are nested. In the "load" mean I first had to select the current save slot:
Afterwards I got a list of all savegames, including one to restart the chapter:
Best Answer
When you are close to a guard or do something that will cause him to notice you you will see a white eye icon appear above their head. You are safe while this is filling, you remain undetected.
Even when the meter is almost full, you have not yet raised a suspicion.
Once the meter fills and three dots appear above it you have achieved "suspicion". You have not yet been detected since the guard is suspicious but is not sure there is someone there. Putting out torches near guards, making noise with throwables or arrows near them or other things that distract them will cause them to jump immediately to this level of alertness.
If you push it further the eye will turn Yellow, at this point you have been detected. The guard knows someone is there but doesn't know where you are.
If you attack a guard with a Yellow eye or he sees you the icon will turn Red, meaning he knows where you are and will start attacking or pursuing you.
There is also another state where the icon turns Orange with an icon that is slightly different from the Red eye. This seems to mean they are still actively pursuing you but don't know where you are. I've also seen guards jump straight from Yellow to Orange.
Raising a suspicion or being detected will both contribute to an opportunist playstyle.