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

Execution · Practiced Mastery
A falling-block puzzle testing fast placement and chain-clear setups under pressure.

Execution · Practiced Mastery
Global flight sim built on real weather and procedures.
Kirby's Star Stacker leans Execution (Practiced Mastery); Microsoft Flight Simulator (2020) leans Execution (Practiced Mastery).
Kirby's Star Stacker leans a little harder on execution, though the gap is small.
Kirby's Star Stacker
Fast block placement under rising pressure demands speed
Microsoft Flight Simulator (2020)
Procedure execution, instrument flying skill
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby's Star Stacker
Solo puzzle with no opponent to model
Microsoft Flight Simulator (2020)
No adaptive opponents, ATC scripted
Kirby's Star Stacker leans a little harder on variance, though the gap is small.
Kirby's Star Stacker
Falling-block sequence is random but rapidly mappable
Microsoft Flight Simulator (2020)
Real weather and live traffic
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby's Star Stacker
Setting up cascading star clears is the strategy layer
Microsoft Flight Simulator (2020)
Flight planning, systems mastery, routing
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.