head to head
Ninja Gaiden II Black asks more than Half-Life 2, and the gap is execution.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.

Execution · Pure Mechanics
Punishing combat execution against fast scripted enemies with deep encounter solutions.
Half-Life 2 leans Execution (Pure Mechanics); Ninja Gaiden II Black leans Execution (Pure Mechanics).
Ninja Gaiden II Black leans clearly harder on execution.
Half-Life 2
Gravity gun and shooting demand precision.
Ninja Gaiden II Black
Frame-tight blocking, dodging and combo routing define survival
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life 2
Combine AI scripted, non-adaptive.
Ninja Gaiden II Black
Aggressive enemies still run scripted, learnable behaviour
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life 2
Almost no randomness.
Ninja Gaiden II Black
Encounters fixed; spawns known after one run
Ninja Gaiden II Black leans clearly harder on optimization.
Half-Life 2
Linear progression with no builds.
Ninja Gaiden II Black
Weapon choice, essence economy and encounter solutions matter
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.