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
A Build-engine shooter rewarding fast, precise gunplay and thorough level exploration to find secrets and supplies.

Execution · Pure Mechanics
A loud, high-endurance test of accurate crowd control against relentless scripted enemy swarms in open arenas.
Ion Fury 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.
Ion Fury
Build-engine movement and precise gun skill define the combat ceiling
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.
Ion Fury
All enemies are scripted with fixed attack and patrol routines
Serious Sam: The First Encounter
All enemies are scripted and follow fixed rush patterns
Ion Fury leans a little harder on variance, though the gap is small.
Ion Fury
Level secrets and enemy ambushes are hidden on first run
Serious Sam: The First Encounter
Enemy placement is consistent across runs; no hidden information
Ion Fury leans a little harder on optimization, though the gap is small.
Ion Fury
Ammo conservation and alternate-fire choices reward systematic play
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.