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
Calm path-routing logic puzzles that are pure constraint satisfaction.

Optimization · Pure Optimization
A long parade of self-contained logic puzzles wrapped in a mystery story.
Lyne leans Optimization (Pure Optimization); Professor Layton and the Diabolical Box 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.
Lyne
Tracing paths has no time pressure
Professor Layton and the Diabolical Box
Stylus taps - zero dexterity demand
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Lyne
Pure solo logic - no opponent
Professor Layton and the Diabolical Box
No opponent; a parade of standalone brainteasers
Professor Layton and the Diabolical Box leans a little harder on variance, though the gap is small.
Lyne
Every board is fully visible and deterministic
Professor Layton and the Diabolical Box
Puzzles are fixed; only their first encounter surprises
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Lyne
Each board is a solvable path-routing constraint puzzle
Professor Layton and the Diabolical Box
Each brainteaser has one clean logical solution to find
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.