blackmesa_mp_gamerules

This entity is not in the FGD by default.
It should not be put directly in a map because it spawns automatically initially. Still can be used for some cases.

blackmesa_mp_gamerules is a point entity available in Black Mesa. This entity controls deathmatch game rules. Spawns automatically with multiplayer game if mp_teamplay and mp_coop are using 0 value. Spawn via console will result countdown with round restart (without map load). If the entity is killed during the countdown, it will partially break the text display. You can use it in combination with point_template when you want to restart round without map load (make sure you removed the previous entity).