head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Execution · Practiced Mastery
A rhythm-driven character action game where everything moves to the beat.

Execution · Pure Mechanics
Faster, gorier sequel built around dismembering aggressive enemies before they swarm you.
Hi-Fi Rush leans Execution (Practiced Mastery); Ninja Gaiden Sigma 2 leans Execution (Pure Mechanics).
Ninja Gaiden Sigma 2 leans a little harder on execution, though the gap is small.
Hi-Fi Rush
Rhythm-timed combos demand precise inputs.
Ninja Gaiden Sigma 2
Delimb-and-finish combat under constant projectile pressure stays brutal
Hi-Fi Rush leans a little harder on reads, though the gap is small.
Hi-Fi Rush
Bosses are scripted, not adaptive.
Ninja Gaiden Sigma 2
Aggressive enemy AI remains pattern-driven
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Hi-Fi Rush
Minimal randomness in encounters.
Ninja Gaiden Sigma 2
Fixed missions; little randomness across runs
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Hi-Fi Rush
Combo routes and chip builds reward optimization.
Ninja Gaiden Sigma 2
Weapon matchups and essence routing reward system study
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.