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

Optimization · Light / Casual
A first-person horror about exploring a haunted Prussian castle.

Optimization · Practiced Mastery
A meditative puzzle game about wrapping rope efficiently around 3D objects.
Amnesia: The Dark Descent leans Optimization (Light / Casual); Zen Bound 2 leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Amnesia: The Dark Descent
Stealth and hiding, low demand.
Zen Bound 2
gentle rope-wrapping motion control
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Amnesia: The Dark Descent
Monsters follow scripted patrols.
Zen Bound 2
no opponent, meditative solo puzzle
Amnesia: The Dark Descent leans a little harder on variance, though the gap is small.
Amnesia: The Dark Descent
Minor encounter variation.
Zen Bound 2
physics settle slightly unpredictably
Zen Bound 2 leans a little harder on optimization, though the gap is small.
Amnesia: The Dark Descent
Oil and sanity management is shallow.
Zen Bound 2
finding efficient wrap paths for coverage
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.