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.

Execution · Practiced Mastery
A pastel platformer where Yoshi carries Baby Mario and perfect scores demand finding everything.
Limbo leans Execution (Practiced Mastery); Super Mario World 2: Yoshi's Island leans Execution (Practiced Mastery).
Super Mario World 2: Yoshi's Island leans a little harder on execution, though the gap is small.
Limbo
Tight platforming with trial-and-error.
Super Mario World 2: Yoshi's Island
Egg-aiming and flutter jumps for 100 percent scores
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.
Super Mario World 2: Yoshi's Island
All enemies are scripted
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Limbo
No randomness.
Super Mario World 2: Yoshi's Island
Collectibles hidden only until found
Super Mario World 2: Yoshi's Island leans a little harder on optimization, though the gap is small.
Limbo
Puzzles have fixed solutions.
Super Mario World 2: Yoshi's Island
Perfect-score runs demand full collectible routing
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.