Difficulty settings (Half-Life: Opposing Force)

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Half-Life: Opposing Force allows players to play through its campaign in one of three different difficulty settings, each affecting the game in a different way. Below is a list of enemies and items and how they are affected in easy, normal and hard difficulty, respectively.

Items and Interactables

The chosen difficulty setting determines how much Health or Suit Energy the player can get from the following items:

Entity	Difficulty	Amount
Health Charger	Easy	50
	Normal	40
	Hard	25
Suit Charger (includes HEV, PCV, Ohms)	Easy	75
	Normal	50
	Hard	35
Health Kit	Easy	15
	Normal	15
	Hard	10
Battery	Easy	15
	Normal	15
	Hard	10

Monsters

The chosen difficulty setting determines, among other things, how much Health each monster will have and how much damage their attacks will deal:

Aliens

Entity	Difficulty	Health	Attack 1	Attack 2	Attack 3	Notes
Headcrab	Easy	10	5	-	-
	Normal	10	10	-	-
	Hard	20	10	-	-
Vortigaunt	Easy	30	10	8	-	Their first attack is their signature 'Electric Zap' attack. Their secondary attack type is a melee "Claw Attack".
	Normal	30	10	10	-
	Hard	60	15	10	-
Houndeye	Easy	20	10	-	-	A houndeye's damage is multiplied based on the size of their squad. (A Two-Houndeye squad will do 30 each, Three will do 45, etc.)
	Normal	20	15	-	-
	Hard	30	15	-	-
Barnacle	Easy	10	-	-	-	Barnacles wait for their prey to touch its long tongue and drag said prey upwards to their mouth instead of actively hunting.
	Normal	10	-	-	-
	Hard	10	-	-	-
Bullsquid	Easy	40	10	15	35	The Bullsquid's first attack is a projectile-based spit attack, the secondary attack is a melee-based 'biting' attack, and finally the third attack is a tail-whipping attack.
	Normal	40	10	25	35
	Hard	120	15	25	35
Alien Grunt	Easy	60	4	10	-	Their first attack is a projectile-based hornet attack that targets the player. The secondary attack is a melee-based punch.
	Normal	90	5	20	-
	Hard	120	8	20	-
Ichthyosaur	Easy	200	20	-	-	The Ichthyosaur only uses a melee-based 'biting' attack. Typically it makes a loud noise if it has found and is pursuing a target in the water.
	Normal	200	35	-	-
	Hard	400	50	-	-
Alien Controller	Easy	60	3	15	-	The first attack is a series of small and quick energy balls. The second attack is a larger energy ball that slowly homes in onto its target.
	Normal	60	4	25	-
	Hard	100	5	35	-
Leech	Easy	2	2	-	-	Typically, leeches are found in groups of two or more at a time in official maps.
	Normal	2	2	-	-
	Hard	2	2	-	-
Pit Drone	Easy	40	15	25	10	The Pit Drone's first attack is a single claw strike. Their second is when they attack with both simultaneously pushing the player back. Their third is their projectile attack.
	Normal	40	25	35	10
	Hard	110	25	35	15
Shock Trooper	Easy	50	5	10	-	Attack 1 is their melee, attack 2 is their main weapon.
	Normal	50	10	10	-
	Hard	80	10	10	-
Voltigore	Easy	320	30	40	-	Attack 1 is melee, attack 2 is their electrical charge.
	Normal	320	40	50	-
	Hard	450	50	60	-
Baby Voltigore	Easy	60	10	-	-
	Normal	60	15	-	-
	Hard	120	20	-	-
Shock Roach	Easy	10	5	-	-
	Normal	10	10	-	-
	Hard	20	10	-	-

Mutated

Entity	Difficulty	Health	Attack 1	Attack 2	Attack 3	Notes
Zombie Scientist	Easy	50	10	25	-	The first attack type is a one-arm slash attack, where-as the second is a heavier 2 arm slashing motion.
	Normal	50	20	40	-
	Hard	100	20	40	-
Zombie Security Guard	Easy	50	10	25	-	The first attack type is a one-arm slash attack, where-as the second is a heavier 2 arm slashing motion.
	Normal	50	20	40	-
	Hard	100	20	40	-
Zombie Soldier	Easy	60	10	25	-	The first attack type is a one-arm slash attack, where-as the second is a heavier 2 arm slashing motion.
	Normal	60	20	40	-
	Hard	120	20	40	-
Gonome	Easy	85	10	10	7	Attack 1 is them single swiping, attack 2 is their throw attack, attack 3 is biting.
	Normal	85	20	10	14
	Hard	160	20	15	14

Turrets

Entity	Difficulty	Health	Damage
Sentry Turret	Easy	40	3
	Normal	40	4
	Hard	50	5

Humans

Entity	Difficulty	Health	Attack 1	Attack 2	Attack 3	Notes
Male Assassin	Easy	50	15	3	-	Their first attack is melee. The secondary attack is their weapon's attack.
	Normal	50	25	4	-
	Hard	80	25	5	-

Entity	Difficulty	Health	Attack 1	Attack 2	Attack 3	Notes
Female Assassin	Easy	30	5	-	-	On Hard Female Assassins will be able to use their invisibility cloak, rendering them nearly invisible unless attacking.
	Normal	50	5	-	-
	Hard	50	8	-	-

Bosses

Entity	Difficulty	Health	Attack 1	Attack 2	Attack 3	Notes
Apache	Easy	150	8	-	-
	Normal	250	10	-	-
	Hard	400	10	-	-
Gargantua	Easy	800	10	3	50	Their first attack is a melee-based rSlash / Swipe attack. Their secondary is a mid-range flamethrower attack, while the third is a slightly ranged stomping attack.
	Normal	800	30	5	100
	Hard	1000	30	5	100
Pit Worm	Easy	70*	30	10	-	*It cannot be killed by conventional weapons, though it does have health stats which are included here. Attack 1 is melee, attack 2 is its' beam attack.
	Normal	90*	40	15	-
	Hard	100*	50	20	-
Gene Worm	Easy	70	10	20	-	Attack 1 is spit, attack 2 is melee.
	Normal	90	20	30	-
	Hard	100	30	40	-

Trivia

• Opposing Force specific stats can be altered in the "skillopfor.cfg" file, located in the "Half-Life\gearbox\" folder.
• Console command "skill" can be used to change the difficulty at any time ingame. However it may not change all difficulty settings properly. (Health Stations, Armor Chargers, etc.)
• Vortigaunts charge their first attack faster on Hard difficulty.