head to head
Human Cannonball asks more than Portal, and the gap is variance.

Optimization · Pure Optimization
A classic arcade game about computing the trajectory to land in a bucket.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Human Cannonball leans Optimization (Pure Optimization); Portal 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.
Human Cannonball
Firing requires no real motor precision
Portal
Portal placement timing modest.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Human Cannonball
No opponent to model in this arcade game
Portal
No adversary modeling player.
Human Cannonball leans clearly harder on variance.
Human Cannonball
Some variations randomize the target distance
Portal
Deterministic chambers; no randomness.
Portal leans a little harder on optimization, though the gap is small.
Human Cannonball
Calculating angle, speed and position is the whole puzzle
Portal
Pure puzzle-solving optimization.
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.