head to head
Donkey Kong Country Returns asks more than Half-Life 2, and the gap is execution.

Execution · Pure Mechanics
Retro Studios' notoriously tough revival of Donkey Kong Country with relentless set-piece levels.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.
Donkey Kong Country Returns leans Execution (Pure Mechanics); Half-Life 2 leans Execution (Pure Mechanics).
Donkey Kong Country Returns leans clearly harder on execution.
Donkey Kong Country Returns
Demanding rocket-barrel and mine-cart sections, strict timing
Half-Life 2
Gravity gun and shooting demand precision.
Half-Life 2 leans a little harder on reads, though the gap is small.
Donkey Kong Country Returns
Scripted hazards, no adaptation
Half-Life 2
Combine AI scripted, non-adaptive.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Donkey Kong Country Returns
Hidden puzzle pieces, fixed once found
Half-Life 2
Almost no randomness.
Donkey Kong Country Returns leans clearly harder on optimization.
Donkey Kong Country Returns
KONG letters and time attack routes are learnable
Half-Life 2
Linear progression with no builds.
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.