head to head
Portal 2 asks more than House Flipper, and the gap is optimization.

Optimization · Pure Optimization
Renovation sim about cleaning and flipping houses.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
House Flipper leans Optimization (Pure Optimization); Portal 2 leans Optimization (Pure Optimization).
Portal 2 leans a little harder on execution, though the gap is small.
House Flipper
Click-and-drag cleaning and placement
Portal 2
Portal placement requires some precision but timing is lenient.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
House Flipper
No adaptive opponents
Portal 2
No opponent; puzzles are static.
House Flipper leans a little harder on variance, though the gap is small.
House Flipper
Light job variety
Portal 2
Puzzles are deterministic with no randomness.
Portal 2 leans clearly harder on optimization.
House Flipper
Renovation routing, budget, profit margins
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.