head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Optimization · Pure Optimization
The beloved theme park builder where you design coasters and manage every detail of a growing park.

Optimization · Pure Optimization
A physics puzzle of engineering Rube Goldberg contraptions to solve fixed goals.
RollerCoaster Tycoon leans Optimization (Pure Optimization); The Incredible Machine 3 leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
RollerCoaster Tycoon
Mouse-driven building with no time pressure
The Incredible Machine 3
Placing parts is untimed, no dexterity needed
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
RollerCoaster Tycoon
Guests are simple, fully mappable simulations
The Incredible Machine 3
Solo puzzle, nothing to predict
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
RollerCoaster Tycoon
Guest spawns and breakdowns barely matter
The Incredible Machine 3
Physics is deterministic, no randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
RollerCoaster Tycoon
Park layout, pricing, and coaster stats are solvable systems
The Incredible Machine 3
Engineering a working contraption from parts IS the game
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.