head to head
Fallout: New Vegas asks more than Antichamber, and the gap is execution.

Optimization · Pure Optimization
A non-Euclidean exploration puzzle testing your willingness to abandon assumptions about space.

Optimization · Pure Optimization
A faction-driven RPG-shooter where build and route planning shape every ending.
Antichamber leans Optimization (Pure Optimization); Fallout: New Vegas leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
Antichamber
Navigation has no twitch demands
Fallout: New Vegas
Shooter inputs with VATS assist
Fallout: New Vegas leans a little harder on reads, though the gap is small.
Antichamber
No opponent; solo non-Euclidean exploration
Fallout: New Vegas
Scripted factions and enemies
Fallout: New Vegas leans clearly harder on variance.
Antichamber
World is deterministic once its rules are understood
Fallout: New Vegas
Some loot and crit RNG
Antichamber leans a little harder on optimization, though the gap is small.
Antichamber
Deducing the non-Euclidean spatial logic and gun mechanics governing each room
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
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.