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 · Pure Optimization
A serene optical-illusion puzzle game about guiding a figure through impossible architecture.

Optimization · Pure Optimization
Open-ended puzzles testing vocabulary-driven creative problem-solving more than any reflex.
Monument Valley III leans Optimization (Pure Optimization); Scribblenauts Unlimited 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 III
No physical skill, gentle tap-based interaction.
Scribblenauts Unlimited
Typing words is the only physical demand
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Monument Valley III
No opponent, solo optical-illusion puzzles.
Scribblenauts Unlimited
Puzzle NPCs are static requests, not minds
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Monument Valley III
Minimal randomness in puzzle design.
Scribblenauts Unlimited
Puzzles are visible; nothing meaningful is hidden
Scribblenauts Unlimited leans a little harder on optimization, though the gap is small.
Monument Valley III
Spatial puzzle logic is fully solvable with correct sequence.
Scribblenauts Unlimited
Finding objects that satisfy puzzle constraints is creative problem-solving
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.