head to head
Hudson's Adventure Island 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 punishing retro platformer where precise jump timing is everything.
Half-Life 2 leans Execution (Pure Mechanics); Hudson's Adventure Island leans Execution (Pure Mechanics).
Hudson's Adventure Island leans clearly harder on execution.
Half-Life 2
Gravity gun and shooting demand precision.
Hudson's Adventure Island
tight platform jumps, brutal timing windows
Half-Life 2 leans a little harder on reads, though the gap is small.
Half-Life 2
Combine AI scripted, non-adaptive.
Hudson's Adventure Island
fixed enemy patterns, no adaptation
Hudson's Adventure Island leans a little harder on variance, though the gap is small.
Half-Life 2
Almost no randomness.
Hudson's Adventure Island
fruit/egg drops randomized
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.
Hudson's Adventure Island
level route and skateboard memorization
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.