head to head
Operation C asks more than Half-Life 2, and the gap is execution.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.

Execution · Pure Mechanics
A classic Contra-style run-and-gun about precise reflexes and firepower.
Half-Life 2 leans Execution (Pure Mechanics); Operation C leans Execution (Pure Mechanics).
Operation C leans clearly harder on execution.
Half-Life 2
Gravity gun and shooting demand precision.
Operation C
precise run-and-gun reflexes and dodging
Half-Life 2 leans a little harder on reads, though the gap is small.
Half-Life 2
Combine AI scripted, non-adaptive.
Operation C
scripted enemy patterns, no adaptation
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life 2
Almost no randomness.
Operation C
minimal randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life 2
Linear progression with no builds.
Operation C
weapon pickup routing knowledge
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.