head to head
D4DJ Groovy Mix asks more than Half-Life 2, and the gap is execution.

Execution · Pure Mechanics
A rhythm game testing pure input timing on fixed DJ-flavored charts.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.
D4DJ Groovy Mix leans Execution (Pure Mechanics); Half-Life 2 leans Execution (Pure Mechanics).
D4DJ Groovy Mix leans clearly harder on execution.
D4DJ Groovy Mix
Note timing under disc-scratch mechanics is the entire test
Half-Life 2
Gravity gun and shooting demand precision.
Half-Life 2 leans a little harder on reads, though the gap is small.
D4DJ Groovy Mix
No opponent - the chart never adapts
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.
D4DJ Groovy Mix
Charts are fixed; only event banners rotate
Half-Life 2
Almost no randomness.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
D4DJ Groovy Mix
Card scoring teams matter for events, not for skill
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.