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.

Execution · Pure Mechanics
An arcade test of jump timing and enemy-flipping precision on a single screen.

Execution · Pure Mechanics
A marble-shooting puzzle where you match colours before the chain reaches the skull.
Mario Bros. leans Execution (Pure Mechanics); Zuma leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Mario Bros.
Precise jumps and bump timing under crowding enemies decide survival
Zuma
Fast accurate shots under chain pressure
Mario Bros. leans a little harder on reads, though the gap is small.
Mario Bros.
Versus mode adds light human interference, enemies are scripted
Zuma
No adaptive opponent
Zuma leans a little harder on variance, though the gap is small.
Mario Bros.
Enemy spawns vary slightly but patterns are quickly learned
Zuma
Ball colour feed is random
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Mario Bros.
POW block usage and enemy routing have known best lines
Zuma
Chain setups, gap shots, combo planning
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.