head to head
Neither is simply harder - they are hard in different places. Psychonauts demands more execution; The Witcher 3: Wild Hunt demands more optimization.

Execution · Practiced Mastery
Moderate platforming execution through inventive but fixed mental levels.

Optimization · Practiced Mastery
A narrative action RPG where build planning matters more than reflex execution.
Psychonauts leans Execution (Practiced Mastery); The Witcher 3: Wild Hunt leans Optimization (Practiced Mastery).
Psychonauts leans clearly harder on execution.
Psychonauts
Platforming and psychic combat need moderate precision
The Witcher 3: Wild Hunt
Combat timing matters but generous dodges forgive sloppy play.
The Witcher 3: Wild Hunt leans a little harder on reads, though the gap is small.
Psychonauts
Mental-world enemies follow fixed behaviours
The Witcher 3: Wild Hunt
Enemies use fixed AI behaviours; no adaptation.
The Witcher 3: Wild Hunt leans a little harder on variance, though the gap is small.
Psychonauts
Level layouts are fixed and quickly known
The Witcher 3: Wild Hunt
Loot rolls and minor combat variance only.
The Witcher 3: Wild Hunt leans clearly harder on optimization.
Psychonauts
Collectible routing and power upgrades add light planning
The Witcher 3: Wild Hunt
Builds, alchemy, and quest routing reward planning.
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.