head to head
Neither is simply harder - they are hard in different places. Monkey Island 2: LeChuck's Revenge demands more variance; Portal 2 demands more execution.

Optimization · Pure Optimization
A dense layered puzzle game demanding methodical inventory and dialogue optimization across four islands.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Monkey Island 2: LeChuck's Revenge leans Optimization (Pure Optimization); Portal 2 leans Optimization (Pure Optimization).
Portal 2 leans clearly harder on execution.
Monkey Island 2: LeChuck's Revenge
Interface is point-and-click; no timing or precision required
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.
Monkey Island 2: LeChuck's Revenge
All puzzles are scripted; no opponent models the player
Portal 2
No opponent; puzzles are static.
Monkey Island 2: LeChuck's Revenge leans clearly harder on variance.
Monkey Island 2: LeChuck's Revenge
Some item locations are initially hidden but deterministic
Portal 2
Puzzles are deterministic with no randomness.
Portal 2 leans a little harder on optimization, though the gap is small.
Monkey Island 2: LeChuck's Revenge
Multi-step puzzle chains reward systematic item and dialogue mapping
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.