From The TimeSplitters Wiki

TNT
Ammo	1 stick
Fire Rate bullets per sec/cartridge time	1
Reload Time	N/A
Damage (per Single Shot) Head/Body/Leg	100% if it sticks to player
Type	Explosive
Zoom	No
Primary Fire	Throws TNT
Secondary Fire	None
Games	All

The TNT is a powerful explosive weapon in TimeSplitters. It can be laid on the ground, on a wall, on an object or occasionally even on a character. You can only carry one stick of TNT at a time, except in TimeSplitters where equipping multiple sticks is possible.

In TimeSplitters: Future Perfect, the weapon's only appearance in the whole game is in the Scotland the Brave Story level.