[Miguel]

pawn Код:

TextDrawShowForPlayer(playerid, TextDrawNivel[playerid]);

pawn Код:

public ShowStats(playerid)
{
  new string[12];

  format(string, sizeof(string), "Nivel: %d", vardelnivel);
  TextDrawSetString(TextDrawNivel[playerid], string);
  TextDrawShowForPlayer(playerid, TextDrawNivel[playerid]);
  return 1;
}

Adivinando como es el callback...