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

Optimization · Practiced Mastery
Tests puzzle solving by picking the right blob transformation for each fixed obstacle.

Optimization · Practiced Mastery
Ezio's Renaissance revenge tale of parkour, assassination, and villa-building across Italy.
A Boy and His Blob leans Optimization (Practiced Mastery); Assassin's Creed II 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.
A Boy and His Blob
Gentle platforming with forgiving timing
Assassin's Creed II
Counter-heavy combat stays forgiving
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
A Boy and His Blob
Solo puzzle world - nothing adapts
Assassin's Creed II
Guards follow scripts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
A Boy and His Blob
Levels are fixed; secrets known after one find
Assassin's Creed II
Fixed world and missions
A Boy and His Blob leans a little harder on optimization, though the gap is small.
A Boy and His Blob
Choosing the right bean transformation per obstacle is the puzzle
Assassin's Creed II
Villa economy and route planning, lightly
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.