head to head
Neither is simply harder - they are hard in different places. Portal 2 demands more execution; True Fear: Forsaken Souls Part 3 demands more variance.

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

Optimization · Pure Optimization
A point-and-click horror finale built on solving fixed puzzles and codes.
Portal 2 leans Optimization (Pure Optimization); True Fear: Forsaken Souls Part 3 leans Optimization (Pure Optimization).
Portal 2 leans clearly harder on execution.
Portal 2
Portal placement requires some precision but timing is lenient.
True Fear: Forsaken Souls Part 3
Point-and-click, no reflex demands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Portal 2
No opponent; puzzles are static.
True Fear: Forsaken Souls Part 3
Story scripted, no adaptive adversary
True Fear: Forsaken Souls Part 3 leans clearly harder on variance.
Portal 2
Puzzles are deterministic with no randomness.
True Fear: Forsaken Souls Part 3
Fixed puzzles, minimal randomness
Portal 2 leans a little harder on optimization, though the gap is small.
Portal 2
Solving the puzzle's logic IS the entire game.
True Fear: Forsaken Souls Part 3
Solving puzzles and inventory chains drives progress
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.