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 · Practiced Mastery
Co-op first-person zombie RPG about improvised weapons on a resort island.

Optimization · Practiced Mastery
Co-op survival testing resource discipline and routes under randomised item spawns.
Dead Island leans Optimization (Practiced Mastery); No More Room in Hell leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Dead Island
first-person melee timing and stamina
No More Room in Hell
Scarce-ammo headshots and melee spacing under pressure
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dead Island
zombies are scripted swarms
No More Room in Hell
Zombies shamble on scripts without modelling players
No More Room in Hell leans a little harder on variance, though the gap is small.
Dead Island
weapon drops and spawns add noise
No More Room in Hell
Dynamic objectives and random item spawns reshuffle each run
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Dead Island
weapon mods and skill builds carry late game
No More Room in Hell
Route knowledge, resource discipline and teamwork are the real edge
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.