Instructions
Load the start screen, select "multiplayer race" ("A" button), and then select the character you wish to play as ("A" button). Be sure to choose the character you wish to play as because even if invisible, your racing characteristics are determined by your kart and racer.
Press the "B" button to return to the main menu screen. Make sure that the character you wish to play as is still selected before you return to the main screen; otherwise you will have to start over.
Select "Solo" mode from the main menu screen ("A" button).
Select the racer you wish to play as by highlighting him or her and then pressing the "A" button.
Press the "B" button to return to the main menu screen.
Select the game mode you wish to play in ("Solo" or "Multi") by pressing the "A" button.
Press the "+" button to begin the game. Do not move the cursor around or try to select a character, or you will be forced to start over. You will now start the race with your character invisible.