Building comparison
head to head
Portal 2vsTerraria
Terraria asks more than Portal 2, and the gap is variance.
Portal 2
Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Terraria
Optimization · Pure Optimization
A 2D sandbox where preparation and gear tiering carry boss fights.
Portal 2 leans Optimization (Pure Optimization); Terraria leans Optimization (Pure Optimization).
Portal 2Terraria
Axis by axis
Execution3 vs 4
Terraria leans a little harder on execution, though the gap is small.
Portal 2
Portal placement requires some precision but timing is lenient.
Terraria
Boss fights require dodging and aim under pressure.
Reads0 vs 0
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.
Terraria
Bosses use scripted attacks; no adaptation.
Variance0 vs 3
Terraria leans clearly harder on variance.
Portal 2
Puzzles are deterministic with no randomness.
Terraria
World seeds and loot drops randomized.
Optimization9 vs 8
Portal 2 leans a little harder on optimization, though the gap is small.
Portal 2
Solving the puzzle's logic IS the entire game.
Terraria
Gear progression and arena prep solve every boss.
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.