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.

Execution · Pure Mechanics
A fast reflex platformer about swinging through hazardous environments precisely.

Execution · Pure Mechanics
A punishing retro platformer where precise jump timing is everything.
Alien Spidy leans Execution (Pure Mechanics); Hudson's Adventure Island 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.
Alien Spidy
Quick swinging and precise reflexes define every level
Hudson's Adventure Island
tight platform jumps, brutal timing windows
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Alien Spidy
Solo platformer with no adaptive opponent
Hudson's Adventure Island
fixed enemy patterns, no adaptation
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Alien Spidy
Hazards are fixed and learnable
Hudson's Adventure Island
fruit/egg drops randomized
Alien Spidy leans a little harder on optimization, though the gap is small.
Alien Spidy
Optimal pathing speeds collection runs
Hudson's Adventure Island
level route and skateboard 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.