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 · Practiced Mastery
A meta puzzle box testing curiosity and one-time discovery more than any repeatable skill.

Optimization · Pure Optimization
A psychological horror experience where puzzle knowledge and avoidance routing matter more than combat skill.
Pony Island leans Optimization (Practiced Mastery); Silent Hill 2 (2001) 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.
Pony Island
Light arcade hopping segments with low demands
Silent Hill 2 (2001)
Clunky combat is intentional; survival over precision
Silent Hill 2 (2001) leans a little harder on reads, though the gap is small.
Pony Island
The devil's tricks are authored scripts, not adaptation
Silent Hill 2 (2001)
Monsters follow simple fixed behaviours, never model the player
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Pony Island
Meta twists are hidden information that spend on first reveal
Silent Hill 2 (2001)
Some item placements are unknown first time; fixed thereafter
Silent Hill 2 (2001) leans a little harder on optimization, though the gap is small.
Pony Island
Code-tinkering puzzles have fixed discoverable solutions
Silent Hill 2 (2001)
Puzzle solutions, route knowledge and weapon use are fully learnable
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.