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

Execution · Practiced Mastery
A dark puzzle-platformer about a tiny girl in a grotesque world.

Execution · Practiced Mastery
A family-friendly 3D platformer with co-op stages.
Little Nightmares leans Execution (Practiced Mastery); Sackboy: A Big Adventure leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Little Nightmares
Stealth platforming demands timing.
Sackboy: A Big Adventure
Light 3D platforming, some co-op timing
Sackboy: A Big Adventure leans a little harder on reads, though the gap is small.
Little Nightmares
Enemies are scripted.
Sackboy: A Big Adventure
Scripted enemies
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Little Nightmares
Minimal randomness.
Sackboy: A Big Adventure
Static levels
Little Nightmares leans a little harder on optimization, though the gap is small.
Little Nightmares
Routes have fixed solutions.
Sackboy: A Big Adventure
Collectible and costume hunting
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.