You hunt for clues and talk to people, solving puzzles mostly in town, and run around trying to kill and not be killed mostly in the woods. I found this really impacted game pacing in a negative way, I'd have enjoyed the combat more if it was sprinkled throughout a little better rather than being so focused that it broke up the pace of play entirely. The game is played from a third person perspective. You control Doc Holliday as she moves throughout the world. If you point at something that can be interacted with it will highlight very subtly and you then click to use, pick up, or what have you the object.
Movement is done via the keyboard, and direction is handled with the mouse.
When a monster is bashing on you this is annoying to say the least and crucial too since many monsters can only be effected with a single weapon. I found it often awkward since camera angles can switch in combat and you have to both line up your shots and deal with the mouse snap auto aiming which had me over adjusting too often and wasting precious ammunition. I didn't try the hard setting. As for the adventure aspect of the game it is pretty much entirely linear. You'll be given tasks in your checklist as you talk to people or find items in the game.