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 · Systems & Chaos
A hidden-object game testing systematic visual search for hidden cats.

Optimization · Pure Optimization
Sci-fi thriller played as the station AI solving its own crisis.
100 Istanbul Cats leans Optimization (Systems & Chaos); Observation leans Optimization (Pure Optimization).
Observation leans a little harder on execution, though the gap is small.
100 Istanbul Cats
Scanning and clicking demands no twitch
Observation
Camera control and interface manipulation
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
100 Istanbul Cats
Solo hidden-object game, no opponent
Observation
Events are fully authored
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
100 Istanbul Cats
Cat placement hidden until found
Observation
Mystery unknown until uncovered
Observation leans a little harder on optimization, though the gap is small.
100 Istanbul Cats
Systematic scanning of the scene finds every cat
Observation
Systems puzzles and station schematics solving
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.