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.

Optimization · Practiced Mastery
Immersive sim where stacking powers and routes unlocks creative kills.

Optimization · Pure Optimization
A scripted RPG where pattern-learning and pacifist routing carry you.
Dishonored 2 leans Optimization (Practiced Mastery); Undertale leans Optimization (Pure Optimization).
Dishonored 2 leans a little harder on execution, though the gap is small.
Dishonored 2
Blink, parry, and aim timing matter.
Undertale
Bullet-hell dodging in scripted patterns
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dishonored 2
Guards scripted; alert patterns fixed.
Undertale
NPCs follow fixed dialogue trees, not adaptive
Dishonored 2 leans a little harder on variance, though the gap is small.
Dishonored 2
Patrols and chaos rating vary lightly.
Undertale
Minimal randomness in encounters
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Dishonored 2
Powers, routes, ghost runs deeply solvable.
Undertale
Learning fixed boss patterns and mercy routes wins
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.