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

Optimization · Practiced Mastery
Retro-styled action RPG mixing fast combat with dense ball-physics puzzles.

Optimization · Practiced Mastery
A golf-puzzle hybrid where Kirby is the ball and every hole has a plannable optimal line.
CrossCode leans Optimization (Practiced Mastery); Kirby's Dream Course leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
CrossCode
fast ball-throwing combat and dash puzzles
Kirby's Dream Course
Power and spin must be set with fine precision
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
CrossCode
no adaptive opponent
Kirby's Dream Course
No adaptive opponent in solo play
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
CrossCode
content is fixed and scripted
Kirby's Dream Course
Fully deterministic boards
Kirby's Dream Course leans a little harder on optimization, though the gap is small.
CrossCode
element puzzles and builds reward systematic play
Kirby's Dream Course
Each hole is a solvable angle-and-power puzzle
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.