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
Off-road simulator about hauling lumber through brutally deformable Russian mud.

Optimization · Pure Optimization
A 2D sandbox where preparation and gear tiering carry boss fights.
Spintires leans Optimization (Practiced Mastery); Terraria leans Optimization (Pure Optimization).
Spintires leans a little harder on execution, though the gap is small.
Spintires
Throttle finesse and winching through mud need careful hands
Terraria
Boss fights require dodging and aim under pressure.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Spintires
No opponents
Terraria
Bosses use scripted attacks; no adaptation.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Spintires
Terrain deforms dynamically; fuel and routes uncertain until scouted
Terraria
World seeds and loot drops randomized.
Terraria leans a little harder on optimization, though the gap is small.
Spintires
Route choice, fuel logistics, and vehicle selection decide success
Terraria
Gear progression and arena prep solve every boss.
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.