head to head
Portal asks more than Pushmo World, and the gap is execution.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.

Optimization · Pure Optimization
A block-pulling puzzle game about solving deterministic 3D climbing puzzles.
Portal leans Optimization (Pure Optimization); Pushmo World leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Portal
Portal placement timing modest.
Pushmo World
Pulling and climbing blocks demands no precision
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Portal
No adversary modeling player.
Pushmo World
Solo puzzle game with no opponent
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Portal
Deterministic chambers; no randomness.
Pushmo World
Puzzles fully deterministic, nothing hidden randomly
Pushmo World leans a little harder on optimization, though the gap is small.
Portal
Pure puzzle-solving optimization.
Pushmo World
Working out the pull sequence to climb is the whole 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.