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.

Optimization · Practiced Mastery
An open, maze-like Kirby where four Kirbys explore an interconnected mirror world.

Optimization · Pure Optimization
Co-op LEGO brawler where unlocking the right character to grab every collectible is the game.
Kirby & The Amazing Mirror leans Optimization (Practiced Mastery); LEGO Batman: The Videogame leans Optimization (Pure Optimization).
Kirby & The Amazing Mirror leans a little harder on execution, though the gap is small.
Kirby & The Amazing Mirror
Easy combat with floaty movement
LEGO Batman: The Videogame
Button-mashy combat with no real fail state
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby & The Amazing Mirror
No adaptive opposition
LEGO Batman: The Videogame
Scripted goons and bosses
Kirby & The Amazing Mirror leans a little harder on variance, though the gap is small.
Kirby & The Amazing Mirror
Maze layout unknown until explored
LEGO Batman: The Videogame
Stud and brick locations fixed
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby & The Amazing Mirror
Navigating the interconnected mirror-world maze for mirror shards
LEGO Batman: The Videogame
Character-ability gating drives collectible completion
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.