head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

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

Execution · Pure Mechanics
One-button rhythm platformer where the hardest levels demand thousands of perfect attempts.
D4DJ Groovy Mix leans Execution (Pure Mechanics); Geometry Dash leans Execution (Pure Mechanics).
Geometry Dash leans a little harder on execution, though the gap is small.
D4DJ Groovy Mix
Note timing under disc-scratch mechanics is the entire test
Geometry Dash
Frame-perfect one-button timing over relentless sequences
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
D4DJ Groovy Mix
No opponent - the chart never adapts
Geometry Dash
Levels never adapt
D4DJ Groovy Mix leans a little harder on variance, though the gap is small.
D4DJ Groovy Mix
Charts are fixed; only event banners rotate
Geometry Dash
Fully deterministic; identical every attempt
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
Geometry Dash
Memorizing layouts is required but solved quickly
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.