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
Deterministic physics puzzles solved by reasoning about magnetism and gravity.

Optimization · Pure Optimization
A perspective puzzle game where objects resize to match how they look when you set them down.
Relicta leans Optimization (Pure Optimization); Superliminal 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.
Relicta
Walking between switches; timing rarely matters
Superliminal
Forced-perspective placement 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.
Relicta
No adversary in the puzzle chambers
Superliminal
No opponent; solo perspective puzzle
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Relicta
Every chamber is fully visible and deterministic
Superliminal
All rooms are deterministic
Relicta leans a little harder on optimization, though the gap is small.
Relicta
Magnetism-gravity logic chains are the entire game
Superliminal
Understanding forced-perspective growth rules to size objects into the correct shape
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.