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 · Pure Optimization
A supernatural teen drama where dialogue timing shapes relationships against a fixed mystery structure.

Optimization · Systems & Chaos
A wordless surreal exploration game about wandering a sleeping girl's dreamscapes.
Oxenfree leans Optimization (Pure Optimization); Yume Nikki leans Optimization (Systems & Chaos).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Oxenfree
Radio tuning and walking demand no physical skill
Yume Nikki
Just walking, no challenge on inputs
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Oxenfree
Supernatural narrative with scripted ghost behaviour
Yume Nikki
No opponent of any kind
Yume Nikki leans a little harder on variance, though the gap is small.
Oxenfree
Dialogue timing creates minor branching uncertainty
Yume Nikki
Random events and obscure unknown triggers
Oxenfree leans a little harder on optimization, though the gap is small.
Oxenfree
Relationship and dialogue choices converge toward fixed endings
Yume Nikki
Mapping the dream worlds to find 24 effects
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.