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
Landmark FPS built on physics puzzles and tight gunplay.

Execution · Practiced Mastery
A whimsical physics game about rolling a sticky ball to absorb the world.
Half-Life 2 leans Execution (Pure Mechanics); We Love Katamari Reroll + Royal Reverie leans Execution (Practiced Mastery).
Half-Life 2 leans a little harder on execution, though the gap is small.
Half-Life 2
Gravity gun and shooting demand precision.
We Love Katamari Reroll + Royal Reverie
careful rolling and steering to grow the katamari
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life 2
Combine AI scripted, non-adaptive.
We Love Katamari Reroll + Royal Reverie
no opposition, purely solo physics play
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life 2
Almost no randomness.
We Love Katamari Reroll + Royal Reverie
object placement varies minimally
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.
We Love Katamari Reroll + Royal Reverie
efficient rolling routes are learnable
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.