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 third-person tower defense about funneling orc hordes into gleefully lethal trap corridors.

Optimization · Pure Optimization
A physics puzzle game about building wobbly towers and bridges from living goo balls.
Orcs Must Die! leans Optimization (Pure Optimization); World of Goo leans Optimization (Pure Optimization).
Orcs Must Die! leans a little harder on execution, though the gap is small.
Orcs Must Die!
Active shooting supplements the traps
World of Goo
Placing goo balls needs only mild precision
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Orcs Must Die!
Orc waves follow fixed paths
World of Goo
No opponent exists
Orcs Must Die! leans a little harder on variance, though the gap is small.
Orcs Must Die!
Minor wave composition randomness
World of Goo
Physics are visible and deterministic
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Orcs Must Die!
Trap placement and kill-corridor economics are the game
World of Goo
Tower structure and goo economy are solvable per level
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.