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
The 1986 original that defined exploration-driven, secret-riddled platforming.

Execution · Practiced Mastery
A 1998 single-player sci-fi shooter exploring an alien planet with agile enemies.
Metroid leans Optimization (Practiced Mastery); Unreal leans Execution (Practiced Mastery).
Unreal leans a little harder on execution, though the gap is small.
Metroid
stiff NES jumps and tough enemy contact
Unreal
Aim and dodging against fast Skaarj carry encounters
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Metroid
creatures follow fixed movement
Unreal
Scripted alien AI never adapts to you
Metroid leans a little harder on variance, though the gap is small.
Metroid
unmarked secrets and bombable blocks hide the map
Unreal
First-run level surprises map out quickly
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Metroid
route and item knowledge transforms the game
Unreal
Weapon choice, secrets, and route knowledge trivialise replays
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.