Clue mode:
Type Akces at the "1) Player 2) Players Q)uit" screen.

Enable background colors:
Type ifokvision at the "1) Player 2) Players Q)uit" screen.

Exit game:
Press [Esc] during game play.

Hidden options:
Type IKE at the "1) Player 2) Players Q)uit" screen. Sound, access to Poison, and clue mode options will become available.

Jump up and left five spaces:
Press the special jump button, 2442, and the special jump button again during game play.

Play as Poison:
Type Poison at the "1) Player 2) Players Q)uit" screen.

Random select:
Press [Tab] when selecting a character.