head to head
Painkiller (2004) 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 relentless wave-clearing shooter that tests sustained aim and movement against massive scripted enemy crowds.
Half-Life 2 leans Execution (Pure Mechanics); Painkiller (2004) leans Execution (Pure Mechanics).
Painkiller (2004) leans clearly harder on execution.
Half-Life 2
Gravity gun and shooting demand precision.
Painkiller (2004)
Constant crowd-control movement against overwhelming enemy counts demands fast aim
Half-Life 2 leans a little harder on reads, though the gap is small.
Half-Life 2
Combine AI scripted, non-adaptive.
Painkiller (2004)
All enemies are scripted waves with fixed attack patterns
Painkiller (2004) leans a little harder on variance, though the gap is small.
Half-Life 2
Almost no randomness.
Painkiller (2004)
Enemy counts and placements are fixed with minimal unknown elements
Painkiller (2004) leans clearly harder on optimization.
Half-Life 2
Linear progression with no builds.
Painkiller (2004)
Tarot card selection and level routing provide a thin solvable layer
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.