How do I play split-screen multiplayer in Sonic & SEGA All-Stars Racing?

From the Select Mode menu, select Split Screen (when signed into Game Center, select Multiplayer from the Select Mode menu, then Local Game). The player who performs this action becomes Player 1.

You will be given the option of playing with 2, 3 or 4 players. Player 1 must select the number of players they wish to play with.

You will be taken to the Select Racer menu, where you must select a racer. (All players except Player 1 must press a button on their chosen input device to enter the game before they can do this.)

Once every player has selected a racer, you will be taken to the Select Multiplayer Mode menu. Player 1 must select the preferred race type.

You will be taken to the Select Course menu. Player 1 must select the preferred course.

The preview screen will appear. Player 1 must press the Enter (↵) key to begin the race.