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 · Pure Mechanics
A run-and-gun shooter testing aim and dodging against scripted zombie waves.
Half-Life 2 leans Execution (Pure Mechanics); Little Red Riding Hood's Zombie BBQ leans Execution (Pure Mechanics).
Little Red Riding Hood's Zombie BBQ leans a little harder on execution, though the gap is small.
Half-Life 2
Gravity gun and shooting demand precision.
Little Red Riding Hood's Zombie BBQ
Aiming and dodging waves of zombies is the whole loop
Half-Life 2 leans a little harder on reads, though the gap is small.
Half-Life 2
Combine AI scripted, non-adaptive.
Little Red Riding Hood's Zombie BBQ
Enemies follow scripted spawn patterns, not adapting minds
Little Red Riding Hood's Zombie BBQ leans a little harder on variance, though the gap is small.
Half-Life 2
Almost no randomness.
Little Red Riding Hood's Zombie BBQ
Minor enemy spawn randomness, nothing meaningful to map
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.
Little Red Riding Hood's Zombie BBQ
Weapon choice and positioning offer light tactical depth
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.