head to head
Tetris Plus 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
Tetris with a puzzle mode - still a test of placement speed and stacking craft.
Half-Life 2 leans Execution (Pure Mechanics); Tetris Plus leans Execution (Pure Mechanics).
Tetris Plus leans clearly harder on execution.
Half-Life 2
Gravity gun and shooting demand precision.
Tetris Plus
Piece placement speed under pressure decides everything
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 Plus
Versus mode adds only light opponent awareness
Tetris Plus leans a little harder on variance, though the gap is small.
Half-Life 2
Almost no randomness.
Tetris Plus
Random piece order is bounded and rapidly mappable
Tetris Plus leans a little harder on optimization, though the gap is small.
Half-Life 2
Linear progression with no builds.
Tetris Plus
Puzzle-mode professor routes have known optimal solutions
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.