head to head
Neither is simply harder - they are hard in different places. Kingdoms and Castles demands more variance; Portal demands more execution.

Optimization · Pure Optimization
Cozy castle-builder with optimization-friendly layouts.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Kingdoms and Castles leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Kingdoms and Castles
no reflex
Portal
Portal placement timing modest.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Kingdoms and Castles
scripted viking raids
Portal
No adversary modeling player.
Kingdoms and Castles leans clearly harder on variance.
Kingdoms and Castles
raid and disaster timing
Portal
Deterministic chambers; no randomness.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Kingdoms and Castles
layouts, taxes, defenses
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.