head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Practiced Mastery
The NES classic that introduced Kirby's copy abilities across a colourful, secret-stuffed Dream Land.

Execution · Practiced Mastery
A scripted puzzle-platformer testing light timing and one-time puzzle solving.
Kirby's Adventure leans Execution (Practiced Mastery); Planet Alpha leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby's Adventure
Easy platforming with optional tougher secrets
Planet Alpha
Chase sequences and stealth timing demand modest precision
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby's Adventure
Scripted enemies and bosses only
Planet Alpha
Enemies follow fixed patrol scripts, no adaptation
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby's Adventure
Hidden switches found once, known forever
Planet Alpha
Everything is scripted; nothing random after one playthrough
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby's Adventure
Copy ability choice and secret routes
Planet Alpha
Day-night puzzle solutions are fixed and learnable
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.