head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Optimization · Pure Optimization
A puzzle adventure built on solving fixed alchemy and logic challenges.

Optimization · Pure Optimization
Sequel that adds a mother-daughter pair to its impossible-architecture puzzles.
Lost Grimoires 2: Shard of Mystery leans Optimization (Pure Optimization); Monument Valley 2 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.
Lost Grimoires 2: Shard of Mystery
Click-driven with no twitch demands
Monument Valley 2
Gentle touch controls, no reflexes
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Lost Grimoires 2: Shard of Mystery
No adaptive opponent in this solo story
Monument Valley 2
Nothing opposes you
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Lost Grimoires 2: Shard of Mystery
Puzzles are fixed once examined, not random
Monument Valley 2
Deterministic authored levels
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Lost Grimoires 2: Shard of Mystery
Alchemy crafting and puzzle logic are the solvable core
Monument Valley 2
Geometry manipulation puzzles with intended solutions
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.