head to head
Splinter Cell: Chaos Theory asks more than Portal, and the gap is variance.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.

Optimization · Pure Optimization
Engineering silent passages through layered guard awareness systems using body-stacking and sound tools.
Portal leans Optimization (Pure Optimization); Splinter Cell: Chaos Theory leans Optimization (Pure Optimization).
Splinter Cell: Chaos Theory leans a little harder on execution, though the gap is small.
Portal
Portal placement timing modest.
Splinter Cell: Chaos Theory
Rappel aim, hand-over-hand movement, and knockouts require care
Splinter Cell: Chaos Theory leans a little harder on reads, though the gap is small.
Portal
No adversary modeling player.
Splinter Cell: Chaos Theory
Guards talk and investigate on scripted awareness trees
Splinter Cell: Chaos Theory leans clearly harder on variance.
Portal
Deterministic chambers; no randomness.
Splinter Cell: Chaos Theory
Conversation triggers and item locations hold some first-run uncertainty
Splinter Cell: Chaos Theory leans a little harder on optimization, though the gap is small.
Portal
Pure puzzle-solving optimization.
Splinter Cell: Chaos Theory
Sound-state management and multi-approach routing are the core skill
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.