head to head
Touchgrind Skate 2 asks more than Half-Life 2, and the gap is execution.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.

Execution · Pure Mechanics
A touch-based skateboarding sim demanding precise finger trick execution.
Half-Life 2 leans Execution (Pure Mechanics); Touchgrind Skate 2 leans Execution (Pure Mechanics).
Touchgrind Skate 2 leans clearly harder on execution.
Half-Life 2
Gravity gun and shooting demand precision.
Touchgrind Skate 2
precise finger-based trick control
Half-Life 2 leans a little harder on reads, though the gap is small.
Half-Life 2
Combine AI scripted, non-adaptive.
Touchgrind Skate 2
no opponent to out-predict
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life 2
Almost no randomness.
Touchgrind Skate 2
minimal randomness in runs
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life 2
Linear progression with no builds.
Touchgrind Skate 2
trick-combo route planning
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.