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.

Optimization · Practiced Mastery
A 3DS Kirby playing with foreground-background depth and the vacuum-everything Hypernova power.

Execution · Practiced Mastery
A dark puzzle-platformer about a tiny girl in a grotesque world.
Kirby: Triple Deluxe leans Optimization (Practiced Mastery); Little Nightmares leans Execution (Practiced Mastery).
Little Nightmares leans a little harder on execution, though the gap is small.
Kirby: Triple Deluxe
Easy main game, modest arena challenges
Little Nightmares
Stealth platforming demands timing.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby: Triple Deluxe
Bosses follow fixed patterns
Little Nightmares
Enemies are scripted.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby: Triple Deluxe
Levels fully deterministic
Little Nightmares
Minimal randomness.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby: Triple Deluxe
Sun-stone hunting and foreground-background gimmick puzzles
Little Nightmares
Routes have fixed solutions.
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.