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.

Optimization · Practiced Mastery
Solving fixed environmental puzzles by trial and error, with light timed stealth.

Optimization · Practiced Mastery
The 1986 original that defined exploration-driven, secret-riddled platforming.
Black the Fall leans Optimization (Practiced Mastery); Metroid leans Optimization (Practiced Mastery).
Metroid leans a little harder on execution, though the gap is small.
Black the Fall
Some timed stealth and chase sections demand light precision
Metroid
stiff NES jumps and tough enemy contact
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Black the Fall
Guards and machines run fixed detection scripts
Metroid
creatures follow fixed movement
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Black the Fall
Puzzle mechanics are unknown until each trial-and-error death
Metroid
unmarked secrets and bombable blocks hide the map
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Black the Fall
Each room is a fixed puzzle with one solution
Metroid
route and item knowledge transforms the 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.