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 · Pure Optimization
An alpine horror tale testing puzzle deduction and exploration under light dread.

Optimization · Practiced Mastery
A meta puzzle box testing curiosity and one-time discovery more than any repeatable skill.
Mundaun leans Optimization (Pure Optimization); Pony Island leans Optimization (Practiced Mastery).
Pony Island leans a little harder on execution, though the gap is small.
Mundaun
Sparse hostile encounters need only basic evasion
Pony Island
Light arcade hopping segments with low demands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Mundaun
The valley's horrors follow folk-tale scripts
Pony Island
The devil's tricks are authored scripts, not adaptation
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Mundaun
Alpine secrets are hidden until uncovered
Pony Island
Meta twists are hidden information that spend on first reveal
Mundaun leans a little harder on optimization, though the gap is small.
Mundaun
Hand-crafted puzzles and routes have fixed solutions
Pony Island
Code-tinkering puzzles have fixed discoverable solutions
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.