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
An early arcade climber demanding tight, repeatable jump execution.

Execution · Pure Mechanics
A precision marble-rolling platformer focused on time trials.
Donkey Kong Junior leans Execution (Pure Mechanics); Marble It Up! Ultra leans Execution (Pure Mechanics).
Marble It Up! Ultra leans a little harder on execution, though the gap is small.
Donkey Kong Junior
precise vine-climbing and jump timing
Marble It Up! Ultra
precise marble physics control is everything
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Donkey Kong Junior
enemies follow fixed patrol patterns
Marble It Up! Ultra
no opponent, solo time-trial skill
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Donkey Kong Junior
minor enemy timing variance
Marble It Up! Ultra
deterministic physics, minimal randomness
Marble It Up! Ultra leans a little harder on optimization, though the gap is small.
Donkey Kong Junior
minimal route memorization needed
Marble It Up! Ultra
route optimization for best times
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.