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

Optimization · Light / Casual
A narrative horror-investigation game where uncovering the mystery outweighs any mechanical challenge.

Optimization · Light / Casual
Tests very little mechanically - a dark authored story carried by light RPG battles.
Call of Cthulhu leans Optimization (Light / Casual); Wadanohara and the Great Blue Sea leans Optimization (Light / Casual).
Call of Cthulhu leans a little harder on execution, though the gap is small.
Call of Cthulhu
light stealth timing, mostly minor
Wadanohara and the Great Blue Sea
Top-down walking and menu battles need no dexterity
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Cthulhu
no opponents, narrative investigation
Wadanohara and the Great Blue Sea
Story characters never adapt to the player
Call of Cthulhu leans a little harder on variance, though the gap is small.
Call of Cthulhu
skill checks add randomness
Wadanohara and the Great Blue Sea
Plot twists are authored, not random
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Cthulhu
stat allocation lightly solvable
Wadanohara and the Great Blue Sea
Simple RPG battles and light puzzles barely resist
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.