Building comparison
head to head
Baldur's Gate II: Shadows of AmnvsPortal
Neither is simply harder - they are hard in different places. Baldur's Gate II: Shadows of Amn demands more variance; Portal demands more execution.
Baldur's Gate II: Shadows of Amn
Optimization · Pure Optimization
The deepest optimization puzzle in the Infinity Engine lineage, rewarding encyclopedic knowledge of 2nd Edition AD&D systems.
Portal
Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Baldur's Gate II: Shadows of Amn leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Baldur's Gate II: Shadows of AmnPortal
Axis by axis
Execution2 vs 4
Portal leans clearly harder on execution.
Baldur's Gate II: Shadows of Amn
Pause-and-plan removes twitch entirely; micro-placement has marginal value
Portal
Portal placement timing modest.
Reads1 vs 0
Baldur's Gate II: Shadows of Amn leans a little harder on reads, though the gap is small.
Baldur's Gate II: Shadows of Amn
Enemies run scripted behaviour patterns, never modelling your tactics
Portal
No adversary modeling player.
Variance5 vs 0
Baldur's Gate II: Shadows of Amn leans clearly harder on variance.
Baldur's Gate II: Shadows of Amn
Loot randomization and enemy ability use create hidden-information layers
Portal
Deterministic chambers; no randomness.
Optimization10 vs 8
Baldur's Gate II: Shadows of Amn leans clearly harder on optimization.
Baldur's Gate II: Shadows of Amn
Mage spell sequences, dual-class builds and Spellhold routing define mastery
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.