head to head
Portal asks more than Day of the Tentacle, and the gap is execution.

Optimization · Pure Optimization
A time-travel puzzle game built entirely on deducing cross-era item interactions with no randomness.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Day of the Tentacle leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Day of the Tentacle
SCUMM interface eliminates any timing or motor demand
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.
Day of the Tentacle
No opponent; multi-era puzzles are fully scripted
Portal
No adversary modeling player.
Day of the Tentacle leans a little harder on variance, though the gap is small.
Day of the Tentacle
Deterministic world state across three time periods
Portal
Deterministic chambers; no randomness.
Day of the Tentacle leans a little harder on optimization, though the gap is small.
Day of the Tentacle
Cross-era cause-and-effect chains form a tightly solvable logic 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.