Building comparison
head to head
Bloons TD 6vsFactorio
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.
Bloons TD 6
Optimization · Pure Optimization
A deep tower defense about popping waves of balloons with monkey towers.
Factorio
Optimization · Pure Optimization
A factory-engineering sandbox about scaling throughput against your own bottlenecks.
Bloons TD 6 leans Optimization (Pure Optimization); Factorio leans Optimization (Pure Optimization).
Bloons TD 6Factorio
Axis by axis
Execution1 vs 2
Factorio leans a little harder on execution, though the gap is small.
Bloons TD 6
Placement clicks only; no dexterity ceiling
Factorio
Some APM in early hand-crafting; otherwise irrelevant.
Reads0 vs 0
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Bloons TD 6
Bloon waves are fixed and known
Factorio
Biters follow fixed pollution rules; no adaptive opponent.
Variance1 vs 1
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Bloons TD 6
Wave order is deterministic; tiny targeting randomness
Factorio
Resource patch placement adds minor map randomness.
Optimization9 vs 10
Factorio leans a little harder on optimization, though the gap is small.
Bloons TD 6
Tower placement, upgrades, and economy are near-solvable
Factorio
Throughput, ratios, and logistics are 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.