head to head
Half-Life 2 asks more than Duck Hunt, and the gap is optimization.

Execution · Pure Mechanics
The NES light-gun classic of shooting ducks and enduring the dog.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.
Duck Hunt leans Execution (Pure Mechanics); Half-Life 2 leans Execution (Pure Mechanics).
Duck Hunt leans a little harder on execution, though the gap is small.
Duck Hunt
Pure light-gun aim and reaction speed
Half-Life 2
Gravity gun and shooting demand precision.
Half-Life 2 leans a little harder on reads, though the gap is small.
Duck Hunt
Ducks fly on simple patterns
Half-Life 2
Combine AI scripted, non-adaptive.
Duck Hunt leans a little harder on variance, though the gap is small.
Duck Hunt
Flight paths vary a little
Half-Life 2
Almost no randomness.
Half-Life 2 leans clearly harder on optimization.
Duck Hunt
Almost nothing to optimise beyond aim
Half-Life 2
Linear progression with no builds.
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.