Building comparison
head to head
FactoriovsPoly Bridge 2
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.
Factorio
Optimization · Pure Optimization
A factory-engineering sandbox about scaling throughput against your own bottlenecks.
Poly Bridge 2
Optimization · Pure Optimization
Physics bridge-builder where cheaper, weirder solutions are the real game.
Factorio leans Optimization (Pure Optimization); Poly Bridge 2 leans Optimization (Pure Optimization).
FactorioPoly Bridge 2
Axis by axis
Execution2 vs 1
Factorio leans a little harder on execution, though the gap is small.
Factorio
Some APM in early hand-crafting; otherwise irrelevant.
Poly Bridge 2
Mouse-driven building has no dexterity 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.
Factorio
Biters follow fixed pollution rules; no adaptive opponent.
Poly Bridge 2
No adversary present
Variance1 vs 1
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Factorio
Resource patch placement adds minor map randomness.
Poly Bridge 2
Deterministic physics; outcomes are fully replayable
Optimization10 vs 9
Factorio leans a little harder on optimization, though the gap is small.
Factorio
Throughput, ratios, and logistics are the entire game.
Poly Bridge 2
Budget-constrained engineering is a pure optimization problem
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.