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
A monochrome puzzle-platformer about a boy lost in limbo.

Optimization · Practiced Mastery
Solving fixed gravity-manipulation puzzles with light physics platforming.
Limbo leans Execution (Practiced Mastery); Rochard leans Optimization (Practiced Mastery).
Limbo leans a little harder on execution, though the gap is small.
Limbo
Tight platforming with trial-and-error.
Rochard
Light platforming and aimed throws, rarely demanding
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Limbo
Hazards are scripted.
Rochard
Guards follow simple scripts, never adapt
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Limbo
No randomness.
Rochard
Puzzle rooms are fixed and visible
Rochard leans a little harder on optimization, though the gap is small.
Limbo
Puzzles have fixed solutions.
Rochard
Gravity-manipulation puzzles each have a findable solution
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.