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

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

Optimization · Pure Optimization
Long-horizon resource and commander optimization with alliance-war prediction at the top end.
Portal 2 leans Optimization (Pure Optimization); Rise of Kingdoms leans Optimization (Pure Optimization).
Portal 2 leans clearly harder on execution.
Portal 2
Portal placement requires some precision but timing is lenient.
Rise of Kingdoms
Tapping commands has no physical ceiling
Rise of Kingdoms leans clearly harder on reads.
Portal 2
No opponent; puzzles are static.
Rise of Kingdoms
Alliance wars involve outguessing rival players' timing and targets
Rise of Kingdoms leans clearly harder on variance.
Portal 2
Puzzles are deterministic with no randomness.
Rise of Kingdoms
Commander pulls and event rolls gate progression
Portal 2 leans clearly harder on optimization.
Portal 2
Solving the puzzle's logic IS the entire game.
Rise of Kingdoms
Build queues, commander pairings and resource math dominate
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.