To unlock cheat mode press Up, Up, Up, B, B, Y, Y, Select, Up, Down, Left, Right, B, Up, Y when the music begins at the Virgin logo screen. Enter the entire controller sequence before the logo disappears. A tone will be played to confirm correct code entry. Enter the options screen to access a level select and cheat menu.
To add ten seconds to the clock pause game play and press A, B, B, A, A, B, B, A.