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 · Pure Mechanics
A marble-rolling platformer testing precise tilt control.

Execution · Pure Mechanics
A loud, high-endurance test of accurate crowd control against relentless scripted enemy swarms in open arenas.
Marble Mountain leans Execution (Pure Mechanics); Serious Sam: The First Encounter leans Execution (Pure Mechanics).
Serious Sam: The First Encounter leans a little harder on execution, though the gap is small.
Marble Mountain
precise tilt-control marble navigation
Serious Sam: The First Encounter
Sustained accurate fire against enormous enemy hordes demands constant aim
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Marble Mountain
no opponent, solo obstacle courses
Serious Sam: The First Encounter
All enemies are scripted and follow fixed rush patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Marble Mountain
minor randomized obstacle timing
Serious Sam: The First Encounter
Enemy placement is consistent across runs; no hidden information
Serious Sam: The First Encounter leans a little harder on optimization, though the gap is small.
Marble Mountain
route and speed optimization per level
Serious Sam: The First Encounter
Enemy priority and positioning strategy are learnable but shallow
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.