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 · Systems & Chaos
A visual novel thriller mixing escape-room puzzles with branching life-or-death story routes.

Optimization · Systems & Chaos
A narrative mystery testing deduction by matching evidence against scripted lies.
999: Nine Hours, Nine Persons, Nine Doors leans Optimization (Systems & Chaos); A Case of Distrust 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.
999: Nine Hours, Nine Persons, Nine Doors
Tapping through text and puzzles, zero dexterity
A Case of Distrust
Pure dialogue and menu selection
A Case of Distrust leans a little harder on reads, though the gap is small.
999: Nine Hours, Nine Persons, Nine Doors
Characters follow a fixed script, never adapt
A Case of Distrust
Suspects lie by script, not in response to you
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
999: Nine Hours, Nine Persons, Nine Doors
Hidden story branches and twists drive first playthroughs
A Case of Distrust
The mystery is hidden information until evidence reveals it
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
999: Nine Hours, Nine Persons, Nine Doors
Escape-room puzzles and route flowchart are fully solvable
A Case of Distrust
Matching statements against evidence is a deduction puzzle
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.