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

Execution · Practiced Mastery
Remake of the original Metroid with modern movement and a stealth epilogue.

Execution · Practiced Mastery
An open-world revenge tale where a new shapeshifter hunts Alex Mercer through plague-zoned New York.
Metroid: Zero Mission leans Execution (Practiced Mastery); Prototype 2 leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Metroid: Zero Mission
polished 2D movement plus a stealth finale
Prototype 2
Power-swapping combat and traversal demand decent dexterity
Prototype 2 leans a little harder on reads, though the gap is small.
Metroid: Zero Mission
enemies and pirates are scripted
Prototype 2
Blackwatch and infected never adapt
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Metroid: Zero Mission
hidden passages unknown only once
Prototype 2
Sandbox encounters carry slight randomness
Metroid: Zero Mission leans a little harder on optimization, though the gap is small.
Metroid: Zero Mission
sequence breaks and route optimization are celebrated
Prototype 2
Mutation upgrades and target-hunting routes reward planning
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.