head to head
TimeSplitters asks more than Half-Life 2, and the gap is reads.

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

Execution · Pure Mechanics
A fast arcade FPS whose skill test is twitch aim plus couch-rival prediction.
Half-Life 2 leans Execution (Pure Mechanics); TimeSplitters leans Execution (Pure Mechanics).
TimeSplitters leans a little harder on execution, though the gap is small.
Half-Life 2
Gravity gun and shooting demand precision.
TimeSplitters
Fast arcade gunplay rewards twitch aim
TimeSplitters leans clearly harder on reads.
Half-Life 2
Combine AI scripted, non-adaptive.
TimeSplitters
Local multiplayer adds human guessing; bots do not adapt
TimeSplitters leans a little harder on variance, though the gap is small.
Half-Life 2
Almost no randomness.
TimeSplitters
Spawn and pickup timing add mild uncertainty
TimeSplitters leans a little harder on optimization, though the gap is small.
Half-Life 2
Linear progression with no builds.
TimeSplitters
Challenge times and map control are learnable
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.