head to head
Tetris: Axis asks more than Half-Life 2, and the gap is variance.

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

Execution · Pure Mechanics
A portable Tetris entry with varied modes atop the classic falling-block formula.
Half-Life 2 leans Execution (Pure Mechanics); Tetris: Axis leans Execution (Pure Mechanics).
Tetris: Axis leans clearly harder on execution.
Half-Life 2
Gravity gun and shooting demand precision.
Tetris: Axis
fast precise piece placement and rotation
Half-Life 2 leans a little harder on reads, though the gap is small.
Half-Life 2
Combine AI scripted, non-adaptive.
Tetris: Axis
no opponent modeling in main mode
Tetris: Axis leans clearly harder on variance.
Half-Life 2
Almost no randomness.
Tetris: Axis
random piece sequence drives play
Tetris: Axis leans clearly harder on optimization.
Half-Life 2
Linear progression with no builds.
Tetris: Axis
stacking strategy and clear efficiency
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.