[Basicz]

Err, I think you only explained how to add entrances in the .cfg file.

Double loops

pawn Code:

public OnPlayerPickUpPickup(playerid, pickupid)
{
    for(new i = 0;i < sizeof(EntranceRef);i++)
    {
        if(
            IsPlayerInRangeOfPoint(playerid,2,Entrances[i][outside_x],Entrances[i][outside_y],Entrances[i][outside_z])
            &&
            GetPlayerVirtualWorld(playerid) == Entrances[i][outside_w]
        )
        {
            GameTextForPlayer(playerid, "~w~Type ~r~/door~w~ to go inside", 5000, 5);
            return 1;
        }
    }
    for(new i = 0;i < sizeof(EntranceRef);i++)
    {
        if(
            IsPlayerInRangeOfPoint(playerid,2,Entrances[i][inside_x],Entrances[i][inside_y],Entrances[i][inside_z])
            &&
            GetPlayerVirtualWorld(playerid) == Entrances[i][inside_w]
        )
        {
            GameTextForPlayer(playerid, "~w~Type ~r~/door~w~ to go outside", 5000, 5);
            return 1;
        }
    }
    return 1;
}

Rating how do you explain : 2.5/10

Nice code though.