head to head
Eye of the Beholder III: Assault on Myth Drannor asks more than Portal 2, and the gap is variance.

Optimization · Pure Optimization
A first-person dungeon RPG testing party building and dungeon-mapping strategy.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Eye of the Beholder III: Assault on Myth Drannor leans Optimization (Pure Optimization); Portal 2 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.
Eye of the Beholder III: Assault on Myth Drannor
Real-time clicks matter but party-based, not twitch
Portal 2
Portal placement requires some precision but timing is lenient.
Eye of the Beholder III: Assault on Myth Drannor leans a little harder on reads, though the gap is small.
Eye of the Beholder III: Assault on Myth Drannor
Monsters follow scripted behavior
Portal 2
No opponent; puzzles are static.
Eye of the Beholder III: Assault on Myth Drannor leans clearly harder on variance.
Eye of the Beholder III: Assault on Myth Drannor
AD&D dice rolls add randomness
Portal 2
Puzzles are deterministic with no randomness.
Portal 2 leans a little harder on optimization, though the gap is small.
Eye of the Beholder III: Assault on Myth Drannor
Party building, spell management and dungeon mapping lead
Portal 2
Solving the puzzle's logic IS the entire 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.