head to head
vs
Half-Life 2vsHappy Feet
Half-Life 2 leans Execution (Pure Mechanics); Happy Feet leans Execution (Practiced Mastery).
Half-Life 2Happy Feet
Axis by axis
Execution6 vs 5
Half-Life 2 leans harder on execution: Gravity gun and shooting demand precision.
Reads1 vs 1
Even - both lean on reads about the same.
Variance1 vs 2
Happy Feet leans harder on variance: Minimal randomness
Optimization3 vs 3
Even - both lean on optimization about the same.
Two games can score the same on an axis and still test it in very different ways - read each rationale, not just the number.