head to head
Metal Gear: Ghost Babel asks more than Portal, and the gap is variance.

Optimization · Pure Optimization
A Game Boy Metal Gear whose grading system turns each stage into a route-optimization puzzle.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Metal Gear: Ghost Babel leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Metal Gear: Ghost Babel leans a little harder on execution, though the gap is small.
Metal Gear: Ghost Babel
Tight Game Boy stealth with demanding boss execution.
Portal
Portal placement timing modest.
Metal Gear: Ghost Babel leans a little harder on reads, though the gap is small.
Metal Gear: Ghost Babel
Guards are deterministic patrol scripts.
Portal
No adversary modeling player.
Metal Gear: Ghost Babel leans clearly harder on variance.
Metal Gear: Ghost Babel
Compact stages hide little once explored.
Portal
Deterministic chambers; no randomness.
Metal Gear: Ghost Babel leans a little harder on optimization, though the gap is small.
Metal Gear: Ghost Babel
Rank system pushes fully optimized, no-alert perfect runs.
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.