head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is variance, and it is a single point.

Optimization · Pure Optimization
A deep tower defense about popping waves of balloons with monkey towers.

Optimization · Pure Optimization
Solving an interstellar logistics and power-engineering puzzle to construct a Dyson Sphere.
Bloons TD 6 leans Optimization (Pure Optimization); Dyson Sphere Program 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.
Bloons TD 6
Placement clicks only; no dexterity ceiling
Dyson Sphere Program
All input is construction clicks with no combat ceiling
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
Dyson Sphere Program
No adversary exists in the default game mode
Dyson Sphere Program leans a little harder on variance, though the gap is small.
Bloons TD 6
Wave order is deterministic; tiny targeting randomness
Dyson Sphere Program
Star system layouts vary per seed but are fully mappable
Dyson Sphere Program leans a little harder on optimization, though the gap is small.
Bloons TD 6
Tower placement, upgrades, and economy are near-solvable
Dyson Sphere Program
Interstellar logistics and sphere construction are a pure engineering optimisation 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.