[AdamsLT]

Your code should be causing lots of compilation errors.
See if this works.

Place this at the top of your gamemode

PHP код:

#define MapCount 2 //change this number to the amount of maps you have in your gamemode
static MapChange = 0; 


This will be used to determine if you have reached the end of your maps and if you should start from the beginning again.

Here are the timers:

PHP код:

forward MapTimer();
public MapTimer()
{
    MapChange++;
    if ( MapChange == MapCount )
        MapChange = 0;
    
    GameTextForAll("~y~LOADING NEW MAP", 4000, 6);
    SetTimer("StartNewMap", 4000, false);
    return 1;
}
forward StartNewMap();
public StartNewMap()
{
   for(new i = 0; i < MAX_PLAYERS; i++) 
   {
        SpawnPlayer(i);
        SendClientMessage(i, -1, "{FF0000}[SERVER]: The map has been changed, You can start playing now.");
  }
  return 1;
} 


Place this in OnGameModeInit()

PHP код:

SetTimer("MapTimer",180000,true); 


Keep the OnPlayerSpawn() code like you did in your initial post.