head to head
Neither is simply harder - they are hard in different places. Portal 2 demands more execution; Sid Meier's Civilization demands more variance.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.

Optimization · Pure Optimization
Long-horizon empire optimization over a randomly dealt but mappable map.
Portal 2 leans Optimization (Pure Optimization); Sid Meier's Civilization leans Optimization (Pure Optimization).
Portal 2 leans clearly harder on execution.
Portal 2
Portal placement requires some precision but timing is lenient.
Sid Meier's Civilization
Turn-based clicking, zero physical demand
Sid Meier's Civilization leans a little harder on reads, though the gap is small.
Portal 2
No opponent; puzzles are static.
Sid Meier's Civilization
AI leaders follow mappable personalities, not adaptive minds
Sid Meier's Civilization leans clearly harder on variance.
Portal 2
Puzzles are deterministic with no randomness.
Sid Meier's Civilization
Map generation and combat rolls hide early information
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Portal 2
Solving the puzzle's logic IS the entire game.
Sid Meier's Civilization
Tech routing, expansion and economy are deeply solvable
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.