head to head
The Elder Scrolls V: Skyrim asks more than Mystery Case Files: 13th Skull, and the gap is execution.

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

Optimization · Pure Optimization
An open-world RPG mostly about discovering and stacking exploitable progression systems.
Mystery Case Files: 13th Skull leans Optimization (Pure Optimization); The Elder Scrolls V: Skyrim leans Optimization (Pure Optimization).
The Elder Scrolls V: Skyrim leans clearly harder on execution.
Mystery Case Files: 13th Skull
Pointing and clicking, no twitch demand
The Elder Scrolls V: Skyrim
Combat is forgiving; aim and timing rarely punish you.
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
The Elder Scrolls V: Skyrim
Enemy AI is scripted and exploitable; not adaptive.
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
The Elder Scrolls V: Skyrim
Loot tables and leveled lists inject mild randomness.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Mystery Case Files: 13th Skull
Solving puzzles and finding objects is the whole loop
The Elder Scrolls V: Skyrim
Skill stacking, enchant loops, and exploits are deeply solvable.
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.