head to head
Neither is simply harder - they are hard in different places. Oriental Empires demands more reads; Portal 2 demands more execution.

Optimization · Pure Optimization
A 4X strategy game testing empire economy, tech, and military planning.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Oriental Empires leans Optimization (Pure Optimization); Portal 2 leans Optimization (Pure Optimization).
Portal 2 leans clearly harder on execution.
Oriental Empires
Turn-based commands need no twitch precision
Portal 2
Portal placement requires some precision but timing is lenient.
Oriental Empires leans clearly harder on reads.
Oriental Empires
Multiplayer rewards anticipating rivals, but AI is scripted
Portal 2
No opponent; puzzles are static.
Oriental Empires leans clearly harder on variance.
Oriental Empires
Combat and event randomness, mostly bounded
Portal 2
Puzzles are deterministic with no randomness.
Portal 2 leans a little harder on optimization, though the gap is small.
Oriental Empires
Economy, tech, and army development decide empires
Portal 2
Solving the puzzle's logic IS the entire game.
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.