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

Execution · Pure Mechanics
A minimalist endless runner testing precise tap timing.

Execution · Pure Mechanics
A classic beat-em-up demanding execution against scripted enemy waves.
Steppy Pants leans Execution (Pure Mechanics); Teenage Mutant Ninja Turtles III: The Manhattan Project leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Steppy Pants
precise tap timing for stepping rhythm
Teenage Mutant Ninja Turtles III: The Manhattan Project
beat-em-up timing and enemy juggling
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Steppy Pants
no opponent, solo endless runner
Teenage Mutant Ninja Turtles III: The Manhattan Project
enemies run simple fixed scripts
Steppy Pants leans a little harder on variance, though the gap is small.
Steppy Pants
randomized obstacle/terrain generation
Teenage Mutant Ninja Turtles III: The Manhattan Project
minor enemy spawn randomness
Teenage Mutant Ninja Turtles III: The Manhattan Project leans a little harder on optimization, though the gap is small.
Steppy Pants
minor route/timing pattern learning
Teenage Mutant Ninja Turtles III: The Manhattan Project
character choice and route memorization
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.