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
A live-action visual novel weaving five strangers' stories together across one chaotic day in Shibuya.

Optimization · Systems & Chaos
A visual novel thriller mixing escape-room puzzles with branching life-or-death story routes.
428: Shibuya Scramble leans Optimization (Pure Optimization); 999: Nine Hours, Nine Persons, Nine Doors leans Optimization (Systems & Chaos).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
428: Shibuya Scramble
Reading and choosing only
999: Nine Hours, Nine Persons, Nine Doors
Tapping through text and puzzles, zero dexterity
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
428: Shibuya Scramble
No opponent, only branching script
999: Nine Hours, Nine Persons, Nine Doors
Characters follow a fixed script, never adapt
999: Nine Hours, Nine Persons, Nine Doors leans a little harder on variance, though the gap is small.
428: Shibuya Scramble
Cross-character consequences hidden until triggered
999: Nine Hours, Nine Persons, Nine Doors
Hidden story branches and twists drive first playthroughs
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
428: Shibuya Scramble
Mapping timeline interactions to dodge bad endings
999: Nine Hours, Nine Persons, Nine Doors
Escape-room puzzles and route flowchart are fully 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.