head to head
Neither is simply harder - they are hard in different places. Pokémon Legends: Arceus demands more variance; Portal 2 demands more optimization.

Optimization · Pure Optimization
Action-leaning Pokémon spinoff about catching in real time across ancient Hisui.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Pokémon Legends: Arceus leans Optimization (Pure Optimization); Portal 2 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.
Pokémon Legends: Arceus
Real-time dodging, sneaking, and aimed throws
Portal 2
Portal placement requires some precision but timing is lenient.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Pokémon Legends: Arceus
Wild and boss behavior is scripted
Portal 2
No opponent; puzzles are static.
Pokémon Legends: Arceus leans clearly harder on variance.
Pokémon Legends: Arceus
Spawn tables and outbreak randomness
Portal 2
Puzzles are deterministic with no randomness.
Portal 2 leans clearly harder on optimization.
Pokémon Legends: Arceus
Research tasks and agile-strong style choices reward planning
Portal 2
Solving the puzzle's logic IS the entire game.
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.