head to head
Tempest 4000 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 fast tube shooter testing reflexes and target prioritization at high speed.
Half-Life 2 leans Execution (Pure Mechanics); Tempest 4000 leans Execution (Pure Mechanics).
Tempest 4000 leans clearly harder on execution.
Half-Life 2
Gravity gun and shooting demand precision.
Tempest 4000
Rapid-fire reflexes and tube movement decide survival
Half-Life 2 leans a little harder on reads, though the gap is small.
Half-Life 2
Combine AI scripted, non-adaptive.
Tempest 4000
Enemies follow scripted-random spawns, not adapting
Tempest 4000 leans clearly harder on variance.
Half-Life 2
Almost no randomness.
Tempest 4000
Enemy spawn patterns add measured chaos
Tempest 4000 leans a little harder on optimization, though the gap is small.
Half-Life 2
Linear progression with no builds.
Tempest 4000
Power-up timing and lane prioritization optimize score
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.