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

Optimization · Practiced Mastery
A minimalist puzzle platformer about cooperating rectangles, carried by warm narration.
Little Nightmares leans Execution (Practiced Mastery); Thomas Was Alone leans Optimization (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.
Thomas Was Alone
Light precision jumps per quadrilateral
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Little Nightmares
Enemies are scripted.
Thomas Was Alone
No opponent, narrated rectangles
Little Nightmares leans a little harder on variance, though the gap is small.
Little Nightmares
Minimal randomness.
Thomas Was Alone
Levels fully visible and fixed
Thomas Was Alone leans a little harder on optimization, though the gap is small.
Little Nightmares
Routes have fixed solutions.
Thomas Was Alone
Sequencing each character's ability per puzzle
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.