head to head
Super Monkey Ball: Step & Roll asks more than Half-Life 2, and the gap is execution.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.

Execution · Pure Mechanics
A ball-rolling balance game testing precise tilt control through stages.
Half-Life 2 leans Execution (Pure Mechanics); Super Monkey Ball: Step & Roll leans Execution (Pure Mechanics).
Super Monkey Ball: Step & Roll leans clearly harder on execution.
Half-Life 2
Gravity gun and shooting demand precision.
Super Monkey Ball: Step & Roll
Precise tilt-balance control through obstacle courses is decisive
Half-Life 2 leans a little harder on reads, though the gap is small.
Half-Life 2
Combine AI scripted, non-adaptive.
Super Monkey Ball: Step & Roll
Solo with no adaptive opponent
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life 2
Almost no randomness.
Super Monkey Ball: Step & Roll
Stages are fixed and deterministic
Super Monkey Ball: Step & Roll leans clearly harder on optimization.
Half-Life 2
Linear progression with no builds.
Super Monkey Ball: Step & Roll
Finding optimal lines and shortcuts improves times
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.