From The TimeSplitters Wiki

Another Health game. Your like a leech in this game. It has similar rules as Deathmatch.

Objective

Kill other players while gaining health from shooting your opponet. Frist to the score limit or has the most points after time runs out wins.

Restrictions& Rules

• Leech does not appear in TimeSplitters Future Perfect
• No Teams
• Time limits are allowed
• There is no Health Packs or Body Armor in this mode.
• This mode is playable anywhere.