On the left you will have a place to jump and entertain yourself while you wait for your friends to enter your world. It's a simple thing, as it's not the essentials of the map. Pressing the button that says "start game" will send you to this player selector. Depending on the number of players on the map, you can choose between players 1 and 4.To choose your player number you must stand on the pressure plate. When you choose you will be sent to this place, here you will choose with your friends the race track they want to play. It is important that before selecting a track all players have selected a player number. Otherwise you will not be able to play the race.