head to head
Robin Hood: The Legend of Sherwood 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
Puzzle-like stealth levels solved by sequencing your band's abilities optimally.
Portal 2 leans Optimization (Pure Optimization); Robin Hood: The Legend of Sherwood 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.
Robin Hood: The Legend of Sherwood
Mouse-drawn sword duels add a small dexterity layer
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.
Robin Hood: The Legend of Sherwood
Guard patrols follow fixed mappable routines
Robin Hood: The Legend of Sherwood leans clearly harder on variance.
Portal 2
Puzzles are deterministic with no randomness.
Robin Hood: The Legend of Sherwood
Unknown layouts only until scouted
Portal 2 leans a little harder on optimization, though the gap is small.
Portal 2
Solving the puzzle's logic IS the entire game.
Robin Hood: The Legend of Sherwood
Sequencing distractions, knockouts and Merry Men abilities solves each level
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.