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 · Systems & Chaos
Surviving 1000 randomised rooms by mapping each monster's fixed rules.

Optimization · Practiced Mastery
Routing efficient digs and upgrades through a randomised mine.
Spooky's Jump Scare Mansion leans Optimization (Systems & Chaos); SteamWorld Dig leans Optimization (Practiced Mastery).
SteamWorld Dig leans a little harder on execution, though the gap is small.
Spooky's Jump Scare Mansion
Chase sequences need only basic evasion movement
SteamWorld Dig
Digging and platforming need modest precision
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Spooky's Jump Scare Mansion
Specimens follow rules-based behaviour, not adaptive minds
SteamWorld Dig
Enemies follow simple fixed patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Spooky's Jump Scare Mansion
Random room draws and specimen spawns vary each descent
SteamWorld Dig
Randomised mine layouts hide ore and hazards each run
SteamWorld Dig leans a little harder on optimization, though the gap is small.
Spooky's Jump Scare Mansion
Learning each specimen's rules converges runs into routine
SteamWorld Dig
Upgrade routing and efficient dig paths drive progress
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.