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

Execution · Pure Mechanics
An NES run-and-gun testing reflex dodging through memorised enemy gauntlets.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.
Contra Force leans Execution (Pure Mechanics); Half-Life 2 leans Execution (Pure Mechanics).
Contra Force leans clearly harder on execution.
Contra Force
Run-and-gun dodging through bullet-heavy NES stages
Half-Life 2
Gravity gun and shooting demand precision.
Half-Life 2 leans a little harder on reads, though the gap is small.
Contra Force
Terrorist enemies spawn on fixed scripts
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.
Contra Force
Stage layouts never change
Half-Life 2
Almost no randomness.
Contra Force leans a little harder on optimization, though the gap is small.
Contra Force
Character selection and power-up routing help modestly
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.