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

Optimization · Practiced Mastery
A puzzle-leaning platformer testing perspective-flip problem solving more than reflexes.

Optimization · Pure Optimization
Tests creative tool-combination puzzle solving across a metroidvania sandbox.
Super Paper Mario leans Optimization (Practiced Mastery); Supraland: Six Inches Under 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.
Super Paper Mario
Light platforming demands, well below mainline Mario
Supraland: Six Inches Under
First-person platforming and light combat need modest precision
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Super Paper Mario
Enemies follow simple fixed patterns, no adaptation
Supraland: Six Inches Under
Solo world with no adaptive adversary
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Super Paper Mario
Dimension-flip secrets are scripted-but-unknown until found
Supraland: Six Inches Under
Secrets are scripted-but-unknown until discovered
Supraland: Six Inches Under leans a little harder on optimization, though the gap is small.
Super Paper Mario
Solving levels via the 2D/3D flip mechanic is the core test
Supraland: Six Inches Under
Chaining ability tools into puzzle solutions is the core test
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.