head to head
Neither is simply harder - they are hard in different places. Hitman: Absolution demands more variance; Portal 2 demands more optimization.

Optimization · Pure Optimization
Story-driven Hitman entry trading open sandboxes for tighter cinematic stealth.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Hitman: Absolution leans Optimization (Pure Optimization); Portal 2 leans Optimization (Pure Optimization).
Hitman: Absolution leans a little harder on execution, though the gap is small.
Hitman: Absolution
Cover stealth, point-shooting, and tighter action sequences
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.
Hitman: Absolution
Enemies follow scripted detection logic
Portal 2
No opponent; puzzles are static.
Hitman: Absolution leans clearly harder on variance.
Hitman: Absolution
Disguise suspicion feels fuzzy until learned
Portal 2
Puzzles are deterministic with no randomness.
Portal 2 leans clearly harder on optimization.
Hitman: Absolution
Linear-ish levels still reward planned routes
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.