head to head
Orcs Must Die! 2 asks more than Portal 2, and the gap is variance.

Optimization · Pure Optimization
The co-op sequel where two players engineer overlapping trap gauntlets against orc waves.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Orcs Must Die! 2 leans Optimization (Pure Optimization); Portal 2 leans Optimization (Pure Optimization).
Orcs Must Die! 2 leans a little harder on execution, though the gap is small.
Orcs Must Die! 2
Co-op shooting and trap triggering
Portal 2
Portal placement requires some precision but timing is lenient.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Orcs Must Die! 2
Scripted wave pathing
Portal 2
No opponent; puzzles are static.
Orcs Must Die! 2 leans clearly harder on variance.
Orcs Must Die! 2
Endless mode shuffles compositions slightly
Portal 2
Puzzles are deterministic with no randomness.
Portal 2 leans a little harder on optimization, though the gap is small.
Orcs Must Die! 2
Upgrade spirit economy and trap synergies dominate
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.