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
Ezio's Renaissance revenge tale of parkour, assassination, and villa-building across Italy.

Execution · Practiced Mastery
A monochrome puzzle-platformer about a boy lost in limbo.
Assassin's Creed II leans Optimization (Practiced Mastery); Limbo leans Execution (Practiced Mastery).
Limbo leans a little harder on execution, though the gap is small.
Assassin's Creed II
Counter-heavy combat stays forgiving
Limbo
Tight platforming with trial-and-error.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed II
Guards follow scripts
Limbo
Hazards are scripted.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed II
Fixed world and missions
Limbo
No randomness.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed II
Villa economy and route planning, lightly
Limbo
Puzzles 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.