head to head
Amped 3 asks more than Half-Life 2, and the gap is execution.

Execution · Pure Mechanics
A snowboarding game testing trick execution and run routing for high scores.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.
Amped 3 leans Execution (Pure Mechanics); Half-Life 2 leans Execution (Pure Mechanics).
Amped 3 leans clearly harder on execution.
Amped 3
Trick input timing and landing balance are the core test
Half-Life 2
Gravity gun and shooting demand precision.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Amped 3
Solo riding with no adaptive opponent
Half-Life 2
Combine AI scripted, non-adaptive.
Amped 3 leans a little harder on variance, though the gap is small.
Amped 3
Fixed terrain; minor event variation
Half-Life 2
Almost no randomness.
Amped 3 leans clearly harder on optimization.
Amped 3
Line choice and trick chaining maximize scores
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.