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
Sequel that adds a mother-daughter pair to its impossible-architecture puzzles.

Optimization · Pure Optimization
A creative vocabulary puzzle about conjuring the right object for each prompt.
Monument Valley 2 leans Optimization (Pure Optimization); Scribblenauts Unmasked: A DC Comics Adventure 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.
Monument Valley 2
Gentle touch controls, no reflexes
Scribblenauts Unmasked: A DC Comics Adventure
Typing words is the only physical act
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Monument Valley 2
Nothing opposes you
Scribblenauts Unmasked: A DC Comics Adventure
Puzzles are static prompts, no adversary
Scribblenauts Unmasked: A DC Comics Adventure leans a little harder on variance, though the gap is small.
Monument Valley 2
Deterministic authored levels
Scribblenauts Unmasked: A DC Comics Adventure
Objectives are visible; little stays hidden
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Monument Valley 2
Geometry manipulation puzzles with intended solutions
Scribblenauts Unmasked: A DC Comics Adventure
Finding clever word-object solutions is the entire 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.