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
Darker Prime sequel built on mirrored light and dark world traversal.

Optimization · Pure Optimization
Body-altering puzzle platforming where each obstacle has an intended grim solution.
Metroid Prime 2: Echoes leans Optimization (Practiced Mastery); The Missing: J.J. Macfield and the Island of Memories leans Optimization (Pure Optimization).
Metroid Prime 2: Echoes leans a little harder on execution, though the gap is small.
Metroid Prime 2: Echoes
lock-on combat, harsher but still forgiving aim
The Missing: J.J. Macfield and the Island of Memories
Platforming is deliberately loose and forgiving
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Metroid Prime 2: Echoes
Ing follow scripted patterns
The Missing: J.J. Macfield and the Island of Memories
No adaptive opposition exists
Metroid Prime 2: Echoes leans a little harder on variance, though the gap is small.
Metroid Prime 2: Echoes
dark-world hazards surprise until learned
The Missing: J.J. Macfield and the Island of Memories
Hand-crafted puzzles, fixed every run
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Metroid Prime 2: Echoes
dual-world routing and key hunts reward planning
The Missing: J.J. Macfield and the Island of Memories
Using self-mutilation mechanics correctly per puzzle is the test
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.
full breakdown
Metroid Prime 2: Echoes →
full breakdown
The Missing: J.J. Macfield and the Island of Memories →