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
Tetris extended into 3D - spatial packing optimization executed under accelerating pressure.

Execution · Pure Mechanics
A run-and-gun boss rush about dodging scripted patterns with tight inputs.
Blockout leans Execution (Practiced Mastery); Cuphead leans Execution (Pure Mechanics).
Cuphead leans a little harder on execution, though the gap is small.
Blockout
Rotating polycubes on three axes under time pressure strains hands
Cuphead
Tight dodging and parry timing decide every boss.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Blockout
Solo pit - nothing to predict
Cuphead
Bosses cycle scripted phases; no adaptation to player.
Blockout leans a little harder on variance, though the gap is small.
Blockout
Piece sequence is random but quickly bounded
Cuphead
Minor attack-order shuffling between phases.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Blockout
3D packing has optimal layer-clearing patterns to internalise
Cuphead
Loadouts and boss phase order are fully learnable.
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.