head to head
Shogun: Total War asks more than Portal 2, and the gap is variance.

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

Optimization · Pure Optimization
A strategy wargame pairing turn-based management of feudal Japan with real-time mass battles.
Portal 2 leans Optimization (Pure Optimization); Shogun: Total War leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Portal 2
Portal placement requires some precision but timing is lenient.
Shogun: Total War
Real-time battle micro matters but pace is forgiving
Shogun: Total War leans clearly harder on reads.
Portal 2
No opponent; puzzles are static.
Shogun: Total War
Campaign AI daimyos follow mappable behaviors
Shogun: Total War leans clearly harder on variance.
Portal 2
Puzzles are deterministic with no randomness.
Shogun: Total War
Fog of war and agent rolls hide information
Portal 2 leans a little harder on optimization, though the gap is small.
Portal 2
Solving the puzzle's logic IS the entire game.
Shogun: Total War
Campaign economy, army composition and terrain 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.