head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Execution · Pure Mechanics
Old-school platforming execution through short, fixed western levels.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.
Gunman Clive leans Execution (Pure Mechanics); Half-Life 2 leans Execution (Pure Mechanics).
Gunman Clive leans a little harder on execution, though the gap is small.
Gunman Clive
Tight jumps and duck-shoot timing carry all sixteen levels
Half-Life 2
Gravity gun and shooting demand precision.
Half-Life 2 leans a little harder on reads, though the gap is small.
Gunman Clive
Bandits and bosses run fixed patterns
Half-Life 2
Combine AI scripted, non-adaptive.
Half-Life 2 leans a little harder on variance, though the gap is small.
Gunman Clive
Levels never change between attempts
Half-Life 2
Almost no randomness.
Gunman Clive leans a little harder on optimization, though the gap is small.
Gunman Clive
Boss pattern learning and weapon upgrades round out clears
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.