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 · Practiced Mastery
Wave-based co-op horde shooter.

Optimization · Practiced Mastery
A tighter sequel that raises execution demands while deepening the build and meta-progression systems.
Killing Floor 2 leans Execution (Practiced Mastery); Rogue Legacy 2 leans Optimization (Practiced Mastery).
Killing Floor 2 leans a little harder on execution, though the gap is small.
Killing Floor 2
Headshot-focused aim and weapon-switching
Rogue Legacy 2
More demanding platforming and combat than the original
Killing Floor 2 leans a little harder on reads, though the gap is small.
Killing Floor 2
Scripted zeds, no adaptive opponent
Rogue Legacy 2
All enemies follow learned scripted patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Killing Floor 2
Spawn waves and trader loot vary
Rogue Legacy 2
Class randomisation and relic pools create divergent runs
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Killing Floor 2
Perks, weapon synergies, money management
Rogue Legacy 2
Heirloom upgrades and class mastery form a deep meta-progression system
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.