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

Variance · Light / Casual
A narrative horror experience testing curiosity more than any skill axis.

Optimization · Systems & Chaos
A wordless surreal exploration game about wandering a sleeping girl's dreamscapes.
MiSide leans Variance (Light / Casual); 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.
MiSide
Walking and minigames make light physical demands
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.
MiSide
Mita is a scripted character, not an adaptive mind
Yume Nikki
No opponent of any kind
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
MiSide
Story surprises are hidden only until experienced
Yume Nikki
Random events and obscure unknown triggers
Yume Nikki leans a little harder on optimization, though the gap is small.
MiSide
Linear narrative with simple puzzles to step through
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.