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

Execution · Pure Mechanics
Mastering the double-barrel shotgun's rhythm while navigating scripted enemy ambushes across dense urban maps.

Execution · Pure Mechanics
A loud, high-endurance test of accurate crowd control against relentless scripted enemy swarms in open arenas.
Doom II: Hell on Earth leans Execution (Pure Mechanics); Serious Sam: The First Encounter leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Doom II: Hell on Earth
Super Shotgun and movement timing demand precise motor execution
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.
Doom II: Hell on Earth
All enemies are scripted; no opponent models the player
Serious Sam: The First Encounter
All enemies are scripted and follow fixed rush patterns
Doom II: Hell on Earth leans a little harder on variance, though the gap is small.
Doom II: Hell on Earth
Ambush placements are hidden until triggered on first run
Serious Sam: The First Encounter
Enemy placement is consistent across runs; no hidden information
Doom II: Hell on Earth leans a little harder on optimization, though the gap is small.
Doom II: Hell on Earth
Learning enemy placement and resource routes reduces every encounter
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.