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 · Practiced Mastery
Routing efficient digs and upgrades through a randomised mine.

Optimization · Pure Optimization
A grand strategy game set in a fictional matriarchal world.
SteamWorld Dig leans Optimization (Practiced Mastery); Terra Feminarum leans Optimization (Pure Optimization).
SteamWorld Dig leans a little harder on execution, though the gap is small.
SteamWorld Dig
Digging and platforming need modest precision
Terra Feminarum
light strategic-map movement control
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
SteamWorld Dig
Enemies follow simple fixed patterns
Terra Feminarum
AI factions follow fixed strategic logic
SteamWorld Dig leans a little harder on variance, though the gap is small.
SteamWorld Dig
Randomised mine layouts hide ore and hazards each run
Terra Feminarum
battle outcomes and events randomized
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
SteamWorld Dig
Upgrade routing and efficient dig paths drive progress
Terra Feminarum
empire management and strategy dominate play
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.