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

Optimization · Pure Optimization
A perspective puzzle game where objects resize to match how they look when you set them down.

Optimization · Pure Optimization
A puzzle game where photographs layered onto the world physically rebuild missing geometry.
Superliminal leans Optimization (Pure Optimization); Viewfinder 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.
Superliminal
Forced-perspective placement needs light spatial precision
Viewfinder
Placing photo layers needs light spatial precision
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Superliminal
No opponent; solo perspective puzzle
Viewfinder
No opponent; photograph-based puzzle
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Superliminal
All rooms are deterministic
Viewfinder
All scenes are deterministic
Viewfinder leans a little harder on optimization, though the gap is small.
Superliminal
Understanding forced-perspective growth rules to size objects into the correct shape
Viewfinder
Deducing which photo angle reconstructs the geometry needed to progress
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.