Deathmatch is a PvP gamemode where players kill each other to death until the timer runs out. It was removed in 1.01 version of Dread for improvements.
Players spawn on random places of the map each time they spawn. As they kill each other, their score goes up. The player with the highest score wins the game.
Deathmatch in 1.00
Deathmatch in 1.00, however, was different.
Players spawn on random places of the map and have 5 seconds to get in their position with their forcefield on. After 5 seconds, the forcefields vanish and players start fighting each other for 5 minutes. Once a player dies, he can't respawn. If the time runs out but there is more than 1 player, the game ends.
It is known as Sudden Death as of today.