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.

Optimization · Pure Optimization
A whimsical nature adventure that rewards curiosity and experimentation over systematic puzzle solving.

Optimization · Systems & Chaos
A zany LucasArts adventure where a tabloid reporter foils aliens dumbing down humanity with a 60-Hz hum.
Botanicula leans Optimization (Pure Optimization); Zak McKracken and the Alien Mindbenders leans Optimization (Systems & Chaos).
Botanicula leans a little harder on execution, though the gap is small.
Botanicula
Exploration is gentle; no motor challenge anywhere
Zak McKracken and the Alien Mindbenders
Verb-and-click interface; nothing physical.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Botanicula
Ecological fable with no opponent to model
Zak McKracken and the Alien Mindbenders
Dumb aliens run on rails; no adaptation anywhere.
Zak McKracken and the Alien Mindbenders leans a little harder on variance, though the gap is small.
Botanicula
Playful hidden interactions reward experimentation over deduction
Zak McKracken and the Alien Mindbenders
Globe-trotting item requirements are obscure on first play.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Botanicula
Most solutions are found through joyful trial-and-error rather than logic chains
Zak McKracken and the Alien Mindbenders
Multi-character inventory chains form one big solvable puzzle.
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.