head to head
Mark of the Ninja asks more than Portal 2, and the gap is execution.

Optimization · Pure Optimization
Solving fixed 2D guard layouts through precise sound management and upgrade-optimised routing.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Mark of the Ninja leans Optimization (Pure Optimization); Portal 2 leans Optimization (Pure Optimization).
Mark of the Ninja leans clearly harder on execution.
Mark of the Ninja
Precise ledge timing, sound-cone avoidance, and kill windows demand input
Portal 2
Portal placement requires some precision but timing is lenient.
Mark of the Ninja leans a little harder on reads, though the gap is small.
Mark of the Ninja
Guards investigate noise on scripted logic; no player profiling
Portal 2
No opponent; puzzles are static.
Mark of the Ninja leans clearly harder on variance.
Mark of the Ninja
Guard placements are fixed per level; no RNG disrupts routing
Portal 2
Puzzles are deterministic with no randomness.
Portal 2 leans a little harder on optimization, though the gap is small.
Mark of the Ninja
Distraction sequencing, upgrade paths, and ghost-score routing are 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.