head to head
Portal 2 asks more than Quantum Conundrum, and the gap is optimization.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.

Optimization · Pure Optimization
First-person puzzle platformer about flipping physics dimensions mid-jump.
Portal 2 leans Optimization (Pure Optimization); Quantum Conundrum leans Optimization (Pure Optimization).
Quantum Conundrum leans a little harder on execution, though the gap is small.
Portal 2
Portal placement requires some precision but timing is lenient.
Quantum Conundrum
Mid-air dimension-swap platforming demands real timing
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Portal 2
No opponent; puzzles are static.
Quantum Conundrum
No opponent present
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Portal 2
Puzzles are deterministic with no randomness.
Quantum Conundrum
Fully deterministic puzzle rooms
Portal 2 leans clearly harder on optimization.
Portal 2
Solving the puzzle's logic IS the entire game.
Quantum Conundrum
Dimension-switch sequences are the solvable core
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.