head to head
Xenogears asks more than Portal 2, and the gap is variance.

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

Optimization · Pure Optimization
A philosophical JRPG where mech fuel economy, deathblow routing, and ether optimization underpin its scripted encounters.
Portal 2 leans Optimization (Pure Optimization); Xenogears 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.
Portal 2
Portal placement requires some precision but timing is lenient.
Xenogears
Gear AP combos and deathblow inputs require some sequence awareness
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.
Xenogears
All enemies scripted; no adaptive AI
Xenogears leans clearly harder on variance.
Portal 2
Puzzles are deterministic with no randomness.
Xenogears
Random encounter rate and minor gear fuel variance present
Portal 2 leans a little harder on optimization, though the gap is small.
Portal 2
Solving the puzzle's logic IS the entire game.
Xenogears
Deathblow combos, Gear fuel economy, and ether investment are solvable systems
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.