head to head
Neither is simply harder - they are hard in different places. Pushmo World demands more optimization; The Elder Scrolls V: Skyrim demands more variance.

Optimization · Pure Optimization
A block-pulling puzzle game about solving deterministic 3D climbing puzzles.

Optimization · Pure Optimization
An open-world RPG mostly about discovering and stacking exploitable progression systems.
Pushmo World leans Optimization (Pure Optimization); The Elder Scrolls V: Skyrim leans Optimization (Pure Optimization).
The Elder Scrolls V: Skyrim leans a little harder on execution, though the gap is small.
Pushmo World
Pulling and climbing blocks demands no precision
The Elder Scrolls V: Skyrim
Combat is forgiving; aim and timing rarely punish you.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Pushmo World
Solo puzzle game with no opponent
The Elder Scrolls V: Skyrim
Enemy AI is scripted and exploitable; not adaptive.
The Elder Scrolls V: Skyrim leans clearly harder on variance.
Pushmo World
Puzzles fully deterministic, nothing hidden randomly
The Elder Scrolls V: Skyrim
Loot tables and leveled lists inject mild randomness.
Pushmo World leans clearly harder on optimization.
Pushmo World
Working out the pull sequence to climb is the whole game
The Elder Scrolls V: Skyrim
Skill stacking, enchant loops, and exploits are deeply solvable.
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.