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

Optimization · Pure Optimization
Build planning and faction routing through a fixed open world with modest combat demands.

Optimization · Pure Optimization
A scripted RPG where pattern-learning and pacifist routing carry you.
Risen 3: Titan Lords leans Optimization (Pure Optimization); Undertale leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Risen 3: Titan Lords
Dodge-and-strike combat punishes carelessness moderately
Undertale
Bullet-hell dodging in scripted patterns
Undertale leans a little harder on reads, though the gap is small.
Risen 3: Titan Lords
Monsters and humans run fixed AI routines
Undertale
NPCs follow fixed dialogue trees, not adaptive
Risen 3: Titan Lords leans a little harder on variance, though the gap is small.
Risen 3: Titan Lords
World state is scripted; loot variance is minor
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.
Risen 3: Titan Lords
Faction choice, build planning and quest routing dominate power
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.