head to head
Tetris Party 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 Tetris variant collection testing piece-placement speed and stacking.
Half-Life 2 leans Execution (Pure Mechanics); Tetris Party leans Execution (Pure Mechanics).
Tetris Party leans clearly harder on execution.
Half-Life 2
Gravity gun and shooting demand precision.
Tetris Party
Precise fast piece placement decides every game
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life 2
Combine AI scripted, non-adaptive.
Tetris Party
Versus mode adds slight attack-timing prediction
Tetris Party leans a little harder on variance, though the gap is small.
Half-Life 2
Almost no randomness.
Tetris Party
Piece bag is random but bounded and mappable
Tetris Party leans clearly harder on optimization.
Half-Life 2
Linear progression with no builds.
Tetris Party
Stacking strategy has known optimal patterns
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.