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.

Optimization · Pure Optimization
A flash puzzle about rolling a rectangular block into the hole without falling off.

Optimization · Pure Optimization
A mechanical journey adventure solved by understanding the logic of its automaton-filled world.
Bloxorz leans Optimization (Pure Optimization); Syberia leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Bloxorz
Deliberate moves; no time pressure.
Syberia
Walking and clicking; zero reflex demand
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Bloxorz
No opponent at all.
Syberia
NPCs follow scripted dialogue trees with no adaptive modelling
Syberia leans a little harder on variance, though the gap is small.
Bloxorz
Levels are fixed and fully visible.
Syberia
Linear journey with virtually no hidden-information surprises
Bloxorz leans a little harder on optimization, though the gap is small.
Bloxorz
Each level is a literally solvable move puzzle.
Syberia
Mechanical clockwork puzzles require mapping part relationships
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.