head to head
Baby Steps asks more than Half-Life 2, and the gap is execution.

Execution · Pure Mechanics
A physics walking ordeal where controlling each individual footstep is the whole test.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.
Baby Steps leans Execution (Pure Mechanics); Half-Life 2 leans Execution (Pure Mechanics).
Baby Steps leans clearly harder on execution.
Baby Steps
Placing each physics-driven footstep is the entire challenge
Half-Life 2
Gravity gun and shooting demand precision.
Half-Life 2 leans a little harder on reads, though the gap is small.
Baby Steps
Solo hike with no adversary at all
Half-Life 2
Combine AI scripted, non-adaptive.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Baby Steps
Terrain is fixed; only your stumbles are unpredictable
Half-Life 2
Almost no randomness.
Baby Steps leans a little harder on optimization, though the gap is small.
Baby Steps
Route choice up the mountain matters but stays simple
Half-Life 2
Linear progression with no builds.
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.