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

Execution · Practiced Mastery
Isometric movement control while herding Flickies along memorised routes.

Optimization · Practiced Mastery
A narrative action RPG where build planning matters more than reflex execution.
Sonic 3D Blast leans Execution (Practiced Mastery); The Witcher 3: Wild Hunt leans Optimization (Practiced Mastery).
Sonic 3D Blast leans clearly harder on execution.
Sonic 3D Blast
Isometric momentum control and Flicky herding need precise movement
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.
Sonic 3D Blast
Robotnik bosses run fixed patterns
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.
Sonic 3D Blast
Flicky and badnik placements never change
The Witcher 3: Wild Hunt
Loot rolls and minor combat variance only.
The Witcher 3: Wild Hunt leans clearly harder on optimization.
Sonic 3D Blast
Routing each zone for Flickies and emeralds is learnable
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.