Building comparison
head to head
Children of a Dead EarthvsPortal 2
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.
Children of a Dead Earth
Optimization · Pure Optimization
A hard sci-fi spacecraft combat simulator using real physics.
Portal 2
Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Children of a Dead Earth leans Optimization (Pure Optimization); Portal 2 leans Optimization (Pure Optimization).
Children of a Dead EarthPortal 2
Axis by axis
Execution2 vs 3
Portal 2 leans a little harder on execution, though the gap is small.
Children of a Dead Earth
minimal twitch demand, orbital mechanics focus
Portal 2
Portal placement requires some precision but timing is lenient.
Reads1 vs 0
Children of a Dead Earth leans a little harder on reads, though the gap is small.
Children of a Dead Earth
AI opponents follow physics, minimal adaptation
Portal 2
No opponent; puzzles are static.
Variance1 vs 0
Children of a Dead Earth leans a little harder on variance, though the gap is small.
Children of a Dead Earth
deterministic physics, near-zero randomness
Portal 2
Puzzles are deterministic with no randomness.
Optimization10 vs 9
Children of a Dead Earth leans a little harder on optimization, though the gap is small.
Children of a Dead Earth
realistic orbital combat engineering is fully solvable
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.