head to head
Neither is simply harder - they are hard in different places. Portal 2 demands more optimization; Republique demands more variance.

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

Optimization · Pure Optimization
Directing an agent through a surveillance network by routing camera access and managing scripted guard patrols.
Portal 2 leans Optimization (Pure Optimization); Republique leans Optimization (Pure Optimization).
Portal 2 leans a little harder on execution, though the gap is small.
Portal 2
Portal placement requires some precision but timing is lenient.
Republique
Point-and-tap interface removes all twitch demand entirely
Republique leans a little harder on reads, though the gap is small.
Portal 2
No opponent; puzzles are static.
Republique
PRIZM guards follow patrol scripts; no adaptive opponent present
Republique leans clearly harder on variance.
Portal 2
Puzzles are deterministic with no randomness.
Republique
Camera node layout is consistent; hidden items are the only fog
Portal 2 leans clearly harder on optimization.
Portal 2
Solving the puzzle's logic IS the entire game.
Republique
Camera network routing and item discovery sequencing are learnable
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.