head to head
Portal 2 asks more than Monkey Island 2 Special Edition: LeChuck's Revenge, and the gap is execution.

Optimization · Pure Optimization
A classic point-and-click adventure that's a fixed set of logic puzzles to solve.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Monkey Island 2 Special Edition: LeChuck's Revenge leans Optimization (Pure Optimization); Portal 2 leans Optimization (Pure Optimization).
Portal 2 leans clearly harder on execution.
Monkey Island 2 Special Edition: LeChuck's Revenge
no reflex demand, point-and-click only
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 Special Edition: LeChuck's Revenge
no opposing agent to out-think
Portal 2
No opponent; puzzles are static.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Monkey Island 2 Special Edition: LeChuck's Revenge
deterministic puzzle solutions
Portal 2
Puzzles are deterministic with no randomness.
Portal 2 leans a little harder on optimization, though the gap is small.
Monkey Island 2 Special Edition: LeChuck's Revenge
inventory logic puzzles fully solvable
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.