head to head
Legend of Grimrock asks more than Portal 2, and the gap is variance.

Optimization · Pure Optimization
Grid-based dungeon crawler about riddles, secret buttons, and square-dancing around monsters.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Legend of Grimrock 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.
Legend of Grimrock
Real-time grid strafing around slow monsters
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.
Legend of Grimrock
Monsters chase on simple fixed logic
Portal 2
No opponent; puzzles are static.
Legend of Grimrock leans clearly harder on variance.
Legend of Grimrock
Secrets hidden until found, then fixed
Portal 2
Puzzles are deterministic with no randomness.
Portal 2 leans a little harder on optimization, though the gap is small.
Legend of Grimrock
Party builds, riddles, and pressure-plate puzzles dominate
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.