Enter the codes during gameplay, but not while the game is paused.
Crazy Track: Press Up, Left, Right, Right, Down, Up, Down, Up, Select.
Disco Track: Press u, p, l, u, u, g, g, u, Select.
Paint Mode: Press g, u, g, l, l, g, p, u, Select.
See Coordinates: Press Down, Up, Left, Up, Down, Right, Right, Down, Select.
Techno Music: Press Left, Up, Right, Right, Left, Down, Down, Right, Select.