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 · Systems & Chaos
Calm exploration and environmental puzzle-solving under light oxygen pressure.

Optimization · Practiced Mastery
A meta puzzle box testing curiosity and one-time discovery more than any repeatable skill.
Deliver Us the Moon leans Optimization (Systems & Chaos); Pony Island leans Optimization (Practiced Mastery).
Pony Island leans a little harder on execution, though the gap is small.
Deliver Us the Moon
Oxygen-timed traversal asks for calm, not twitch
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.
Deliver Us the Moon
No opponent exists on the abandoned moon
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.
Deliver Us the Moon
Station layouts and story logs are unknown until explored
Pony Island
Meta twists are hidden information that spend on first reveal
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Deliver Us the Moon
Environmental puzzles have single discoverable 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.