Press Down four times, Right, Left, Right, Left at the main menu.
Press Up two times, Left two times, Up two times, Right two times at the main menu.
Player skulls in Arcade mode
Press Up, Right, Down, Left, Up, Right, Down, Left at the difficulty selection menu.
Select single player mode in Arcade mode. Press Down ten times at the difficulty selection screen. The pointer will move underneath the Master difficulty, and the game will start in Savant mode.