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 · Pure Optimization
A speedy GBA metroidvania that doubles its castle into two mirrored layouts to untangle.

Optimization · Practiced Mastery
Acrobatic puzzle-platformer where rewinding time turns every fatal mistake into a do-over.
Castlevania: Harmony of Dissonance leans Optimization (Pure Optimization); Prince of Persia: The Sands of Time leans Optimization (Practiced Mastery).
Prince of Persia: The Sands of Time leans a little harder on execution, though the gap is small.
Castlevania: Harmony of Dissonance
Fast dashes make combat forgiving.
Prince of Persia: The Sands of Time
Acrobatic platforming chains need timing; rewind softens failure
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Castlevania: Harmony of Dissonance
Scripted enemies and bosses.
Prince of Persia: The Sands of Time
Sand creatures attack on fixed cues
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Castlevania: Harmony of Dissonance
Minor relic and drop luck.
Prince of Persia: The Sands of Time
Rewind power removes most consequence of surprise
Castlevania: Harmony of Dissonance leans a little harder on optimization, though the gap is small.
Castlevania: Harmony of Dissonance
Twin-castle navigation and spellbook combos carry it.
Prince of Persia: The Sands of Time
Route reading and dagger resource management solve each room
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.
full breakdown
Castlevania: Harmony of Dissonance →
full breakdown
Prince of Persia: The Sands of Time →