How to change the map in GMod
Type changelevel gm_construct in the server console to switch to that map while keeping every player connected.
changelevel
Changes the server to another map while keeping connected players on the server.
changelevel <mapname> Examples
changelevel gm_flatgrass Move everyone to gm_flatgrass.
changelevel gm_construct Reload the current Sandbox map to clear everything.
Arguments
mapnameRequired- Map file name without the .bsp extension.
What it does
Switches to the named map and brings connected players along without them having to reconnect. This is the usual way to rotate maps by hand. A new gamemode value also takes effect at this point.
The game's own description: Change server to the specified map
Good to know
- Players who lack the map will download it from the Workshop or
sv_downloadurlif available.
Run it on your server
On a SLASHPLAY server, type it in the Console tab of the server page; the reply shows right under it. A value set there lasts until the server restarts. To keep it, add the line to garrysmod/cfg/server.cfg. New to this? Start a GMod server first.
Your own
GMod server.
From $0.03 an hour, only while it runs. New accounts get 6 free tokens.