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 · Pure Optimization
A sandbox city builder that is pure traffic and zoning optimization.

Optimization · Pure Optimization
A visual programming puzzle that teaches algorithmic thinking through factory-floor instruction sequences.
Cities: Skylines leans Optimization (Pure Optimization); Human Resource Machine leans Optimization (Pure Optimization).
Human Resource Machine leans a little harder on execution, though the gap is small.
Cities: Skylines
No reflex demands at all.
Human Resource Machine
Dragging instructions has no timing component
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Cities: Skylines
No adaptive opponent exists in the sandbox.
Human Resource Machine
No opponent; purely computational puzzle
Cities: Skylines leans a little harder on variance, though the gap is small.
Cities: Skylines
Minor disaster events if enabled.
Human Resource Machine
Input data is fixed per level with no randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Cities: Skylines
Traffic flow, zoning, and budgets are fully solvable.
Human Resource Machine
Writing minimal correct assembly-like programs to pass each input sequence
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.