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
First-person puzzle platformer about flipping physics dimensions mid-jump.

Optimization · Practiced Mastery
A co-op yarn puzzle-platformer where two tethered characters solve levels together.
Quantum Conundrum leans Optimization (Pure Optimization); Unravel Two leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Quantum Conundrum
Mid-air dimension-swap platforming demands real timing
Unravel Two
Light platforming plus two-character swing coordination
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Quantum Conundrum
No opponent present
Unravel Two
No adaptive opposition, co-op only
Unravel Two leans a little harder on variance, though the gap is small.
Quantum Conundrum
Fully deterministic puzzle rooms
Unravel Two
Fixed levels, fully visible
Quantum Conundrum leans a little harder on optimization, though the gap is small.
Quantum Conundrum
Dimension-switch sequences are the solvable core
Unravel Two
Puzzles solved by routing two yarn characters together
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.