head to head
Pac-Man 99 asks more than Grand Theft Auto V, and the gap is execution.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.

Execution · Practiced Mastery
Tests fast maze execution and ghost-train routing under randomized attack pressure.
Grand Theft Auto V leans Execution (Practiced Mastery); Pac-Man 99 leans Execution (Practiced Mastery).
Pac-Man 99 leans clearly harder on execution.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Pac-Man 99
Maze steering at speed under jammer pressure decides survival
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Pac-Man 99
98 opponents are anonymous noise, not readable minds
Pac-Man 99 leans clearly harder on variance.
Grand Theft Auto V
Some mission and lobby randomness.
Pac-Man 99
Incoming attacks and ghost spawns randomize each match
Pac-Man 99 leans clearly harder on optimization.
Grand Theft Auto V
Heists, money loops, builds learnable.
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.