Question

Let’s assume

public abstract class Game
{
    // Base
}

public class Poker : Game
{
    // Lobby Object
    // NUMBER OF PLAYERS ( Max )   ----------
}                                            '
                                             '
public class Lobby                           '
{                                            '
    // List<Tables>                          '
}                                            '
                                             '
public class Table                           '
{                                            '
    // List<Player>                <---------'
}

How to access NUMBER OF PLAYERS from Table Object without redundant passing ?

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EDIT I
You misunderstood my question, I’m sorry.
I want to access the maximum number that can join this Table from its game type.
So if It’s a Poker table I want to get NUMBER OF PLAYERS which is equal 10

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EDIT II
Different Game types: Hearts, Spades, Poker, Estimation, … etc
Max number of players are : 4, 4, 10, 4, etc respectively.

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EDIT III
Again, misunderstood my question, I want to be able to do the following :

When player attempt to join a table, I compare target table current
players number with its game type max number of players, so I decide
if the player can or can’t join it !

Answer 1

I think that the following relationship needs to be modelled:

public abstract class Game
{
    // force all Game descendants to implement the property
    public abstract int MaxPlayers { get; } 
}

public class Poker : Game
{
    // Lobby Object
    public List<Lobby> Lobbies { get; set; }

    // NUMBER OF PLAYERS ( Max )
    // the abstract prop needs to be overridden here
    public override int MaxPlayers 
    { 
       get { return 4; } 
    }
}   

public class Lobby
{
    public List<Table> Tables { get; set; }
}

public class Table                           
{                    
    public Game CurrentGame { get; set; }
    public List<Player> Players { get; set; }

    // force the Game instance to be provided as ctor param.
    public Table(Game gameToStart)
    {
        CurrentGame = gameToStart;
    }
}

Inject the Game being played when the Table is instanced:

var pokerGame = new Poker();
// more code here, etc etc

var myTable = new Table(pokerGame);

To get the max number of players allowed in a Table instance:

var maxAllowed = Table.CurrentGame.MaxPlayers;