Thief pretty much defined the stealth game genre, at least it did for me, where it's game over basically if you try to go all out on enemies. I may be wrong but I don't believe cleaning a level of enemies is the way forward in later levels.

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pawelduda 2 hours ago | parent [-]

You can get rid of all human enemies by knocking them unconscious (I play expert mostly so killing is forbidden anyway). But right, if you go rambo even on lower difficulty levels, you'll most likely get overwhelmed

For the rest, you're limited by supplies you buy or find but I believe it's possible to clear mostly everything if you don't miss. I know because I found myself running around the entire map to find the remaining 1% of the loot goal

	▲	rimunroe 10 minutes ago \| parent [-]
		> You can get rid of all human enemies by knocking them unconscious (I play expert mostly so killing is forbidden anyway). But right, if you go rambo even on lower difficulty levels, you'll most likely get overwhelmed I can't recall if they're in Thief 1, but in Thief 2 at least there are guards with helmets which are immune to the blackjack, but afaik none of them are immune to gas arrows/mines.