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

Optimization · Pure Optimization
Generous team-building optimisation against fixed Kalos trainers.

Optimization · Pure Optimization
A fragmented-timeline mystery that asks players to reconstruct causality across escape-room puzzles.
Pokémon Y leans Optimization (Pure Optimization); Zero Escape: Zero Time Dilemma 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.
Pokémon Y
Turn-based menus have no physical ceiling
Zero Escape: Zero Time Dilemma
No physical demands in escape rooms or choice screens
Pokémon Y leans a little harder on reads, though the gap is small.
Pokémon Y
Campaign trainers are scripted; online play is a separate pursuit
Zero Escape: Zero Time Dilemma
Fragment-based story has no adaptive opponent
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Pokémon Y
Encounters and rolls add bounded, mappable randomness
Zero Escape: Zero Time Dilemma
Non-linear fragment order and hidden outcomes obscure the path
Pokémon Y leans a little harder on optimization, though the gap is small.
Pokémon Y
Mega evolutions and EV tools make optimisation the core
Zero Escape: Zero Time Dilemma
Connecting all fragments to reach the true timeline is a logic 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.