head to head
Mario Kart 8 Deluxe asks more than Spelunky, and the gap is reads.

Execution · Twitch Chaos
A kart racer where item luck collides with optimized lines and builds.

Execution · Twitch Chaos
The original procedural platformer that codified the modern roguelike action loop.
Mario Kart 8 Deluxe leans Execution (Twitch Chaos); Spelunky leans Execution (Twitch Chaos).
Spelunky leans a little harder on execution, though the gap is small.
Mario Kart 8 Deluxe
Drift boosts, snaking, and item timing demand precision.
Spelunky
Tight platforming and whip control under constant threat.
Mario Kart 8 Deluxe leans clearly harder on reads.
Mario Kart 8 Deluxe
Human racers bait and block items but mostly reactive.
Spelunky
Enemy AI is scripted; no adaptive opponents.
Spelunky leans a little harder on variance, though the gap is small.
Mario Kart 8 Deluxe
Item distribution heavily randomized by position.
Spelunky
Procedural caves and item rolls shape every run.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Mario Kart 8 Deluxe
Kart build, line, and shortcut knowledge define top times.
Spelunky
Hell route and shortcuts reward solved knowledge.
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.