On the main menu, press down, down, down, down, right, left, right, left.
On the main menu press up, up, left, left, up, up, right, right
Player Skulls (Arcade Only)
On the difficulty menu, press up, right, down, left, up, right, down, left
On 1P mode in Arcade on the difficulty selection screen press down 10 times and the cursor will move automatically under the Master difficulty and the game will automatically start in Savant mode.