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

Optimization · Pure Optimization
A hidden-object adventure about searching scenes and solving fixed puzzles.

Optimization · Pure Optimization
Gentleman puzzler solves a village full of standalone brainteasers.
Mystery Case Files: 13th Skull leans Optimization (Pure Optimization); Professor Layton and the Curious Village 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.
Mystery Case Files: 13th Skull
Pointing and clicking, no twitch demand
Professor Layton and the Curious Village
Stylus taps only; no dexterity pressure at all
Mystery Case Files: 13th Skull leans a little harder on reads, though the gap is small.
Mystery Case Files: 13th Skull
No adaptive opponent, puzzles are fixed
Professor Layton and the Curious Village
No opponent, adaptive or otherwise
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Mystery Case Files: 13th Skull
Hidden-object locations unknown until searched
Professor Layton and the Curious Village
Puzzle answers are hidden until reasoned out, then fixed
Professor Layton and the Curious Village leans a little harder on optimization, though the gap is small.
Mystery Case Files: 13th Skull
Solving puzzles and finding objects is the whole loop
Professor Layton and the Curious Village
Every brainteaser has one clean solvable answer
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.
full breakdown
Mystery Case Files: 13th Skull →
full breakdown
Professor Layton and the Curious Village →