head to head
Tzar: The Burden of the Crown asks more than Portal, and the gap is reads.

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

Optimization · Pure Optimization
Classic RTS economy optimisation with modest micro demands.
Portal leans Optimization (Pure Optimization); Tzar: The Burden of the Crown 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.
Portal
Portal placement timing modest.
Tzar: The Burden of the Crown
RTS macro speed matters, far below esport ceilings
Tzar: The Burden of the Crown leans clearly harder on reads.
Portal
No adversary modeling player.
Tzar: The Burden of the Crown
Human skirmishes reward scouting opponents' intentions
Tzar: The Burden of the Crown leans clearly harder on variance.
Portal
Deterministic chambers; no randomness.
Tzar: The Burden of the Crown
Map fog hides enemy development until scouted
Portal leans a little harder on optimization, though the gap is small.
Portal
Pure puzzle-solving optimization.
Tzar: The Burden of the Crown
Economy build orders and race tech choices decide games
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.