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
The genre-defining loot ARPG whose builds, runes, and trade economy players still optimize decades later.

Optimization · Systems & Chaos
An expanded version of Monster Train's optimization puzzle, with wider clan pairings demanding deeper synergy solving.
Diablo II leans Optimization (Pure Optimization); Monster Train 2 leans Optimization (Systems & Chaos).
Diablo II leans a little harder on execution, though the gap is small.
Diablo II
Positioning and potion reflexes, little else physical
Monster Train 2
No manual timing or motor demands added in the sequel
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Diablo II
Monster AI is fully mappable
Monster Train 2
Scripted enemy waves offer nothing to predict adaptively
Monster Train 2 leans a little harder on variance, though the gap is small.
Diablo II
Loot RNG and random maps drive the grind
Monster Train 2
New clan pairings and relic randomness expand run variation
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Diablo II
Builds, breakpoints, rune economy, magic-find routing are the game
Monster Train 2
Layered synergy solving across dual-clan builds deepens from the original
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.