Building comparison
head to head
Castlevania: Harmony of DissonancevsPortal
Neither is meaningfully harder - they pose close to the same test. The widest gap is variance, and it is a single point.
Castlevania: Harmony of Dissonance
Optimization · Pure Optimization
A speedy GBA metroidvania that doubles its castle into two mirrored layouts to untangle.
Portal
Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Castlevania: Harmony of Dissonance leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Castlevania: Harmony of DissonancePortal
Axis by axis
Execution4 vs 4
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Castlevania: Harmony of Dissonance
Fast dashes make combat forgiving.
Portal
Portal placement timing modest.
Reads0 vs 0
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.
Portal
No adversary modeling player.
Variance1 vs 0
Castlevania: Harmony of Dissonance leans a little harder on variance, though the gap is small.
Castlevania: Harmony of Dissonance
Minor relic and drop luck.
Portal
Deterministic chambers; no randomness.
Optimization7 vs 8
Portal leans a little harder on optimization, though the gap is small.
Castlevania: Harmony of Dissonance
Twin-castle navigation and spellbook combos carry it.
Portal
Pure puzzle-solving optimization.
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.