head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is variance, and it is a single point.

Optimization · Pure Optimization
A knowledge-based mystery solved by mapping a deterministic solar system.

Optimization · Pure Optimization
A block-pulling puzzle game about solving deterministic 3D climbing puzzles.
Outer Wilds leans Optimization (Pure Optimization); Pushmo World 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.
Outer Wilds
Light piloting, mostly forgiving
Pushmo World
Pulling and climbing blocks demands no precision
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Outer Wilds
World is fixed; nothing adapts to you
Pushmo World
Solo puzzle game with no opponent
Outer Wilds leans a little harder on variance, though the gap is small.
Outer Wilds
Loop is deterministic once understood
Pushmo World
Puzzles fully deterministic, nothing hidden randomly
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Outer Wilds
Pure knowledge puzzle - solve the system
Pushmo World
Working out the pull sequence to climb is the whole game
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.