head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Execution · Practiced Mastery
The 3DS Mario Kart that added gliders, underwater driving, and kart customisation.

Execution · Practiced Mastery
Tests fast maze execution and ghost-train routing under randomized attack pressure.
Mario Kart 7 leans Execution (Practiced Mastery); Pac-Man 99 leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Mario Kart 7
Drift boosts, gliding, and underwater control
Pac-Man 99
Maze steering at speed under jammer pressure decides survival
Mario Kart 7 leans a little harder on reads, though the gap is small.
Mario Kart 7
Online lobbies reward anticipating rivals' items
Pac-Man 99
98 opponents are anonymous noise, not readable minds
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Mario Kart 7
Item luck shapes every race
Pac-Man 99
Incoming attacks and ghost spawns randomize each match
Pac-Man 99 leans a little harder on optimization, though the gap is small.
Mario Kart 7
Kart customisation and track-specific routes
Pac-Man 99
Ghost-train routing and target strategies have known best lines
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.