Building comparison
head to head
Left 4 DeadvsPac-Man World Rally
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.
Left 4 Dead
Execution · Twitch Chaos
Co-op zombie shooter whose AI Director reshuffles every run to keep teams honest.
Pac-Man World Rally
Execution · Twitch Chaos
Kart racing where drift skill fights against item-roll chaos on themed tracks.
Left 4 Dead leans Execution (Twitch Chaos); Pac-Man World Rally leans Execution (Twitch Chaos).
Left 4 DeadPac-Man World Rally
Axis by axis
Execution7 vs 6
Left 4 Dead leans a little harder on execution, though the gap is small.
Left 4 Dead
Headshots, melee shoves, and special-infected reaction time
Pac-Man World Rally
Drift timing and shortcut jumps decide clean laps
Reads2 vs 2
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Left 4 Dead
Versus mode adds human ambush mindgames
Pac-Man World Rally
Human races add light item-timing prediction
Variance5 vs 4
Left 4 Dead leans a little harder on variance, though the gap is small.
Left 4 Dead
AI Director randomizes hordes, items, and specials
Pac-Man World Rally
Item rolls scramble positions every race
Optimization5 vs 4
Left 4 Dead leans a little harder on optimization, though the gap is small.
Left 4 Dead
Team spacing, route choice, and resource discipline
Pac-Man World Rally
Track shortcuts and kart picks are learnable edges
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.