Various Codes:

Enter the following at the title screen.
 

Effect                                            Code

 

Black and White Color Scheme:

Die while holding L + B to start playing the game in a black and white color scheme.

 

Introductory Level Skip:

Press Start + Right + Y.

 

Invincibility and High Jump:

Hold Right, Y, L and A, then press start. During the game, press L to become invincible and R to jump higher.

 

Play as Miniature Ardy:

Place the cursor on Game Start in the Presentation Screen, then press Up + X + Start (in that order).

 

Sepia Color Scheme:

Die while holding L + A to start playing the game in a sepia color scheme.

 

Various Passwords:

At the title screen select password then with Ardy pick up and arrange the cherry, grape, and orange blocks with A. There are 5 possible spots for the blocks; on top of the house, hanging from the balloon, on the tree stump, on the table, and on the tree branch.
 

Effect                                                        Password

Scene 00 Prologue                                   Cherry: Balloon, Grape: Table, Orange: Tree.

Scene 01 Mining Town Ablaze                 Cherry: House, Grape: Stump, Orange: Table.

Scene 02 Grounder’s Mine                      Cherry: Tree, Grape: Balloon, Orange: Stump.

Scene 03 Tunnel Chase                          Cherry: Tree, Grape: Table, Orange: Balloon.

Scene 04 Lumberjack Forest                   Cherry: Table, Grape: Stump, Orange: Balloon.

Scene 05 Catry’s Tree Fortress               Cherry: Table, Grape: House, Orange: Stump.

Scene 06 Eaten!!                                     Cherry: Balloon, Grape: House, Orange: Tree.

Scene 07 Ancient Pyramid                      Cherry: Stump, Grape: Table, Orange: Tree.

Scene 08 Mouse Trap                             Cherry: Table, Grape: Tree, Orange: Stump.

Scene 09 Gilson’s Pirate Ship                Cherry: Balloon, Grape: Tree, Orange: Table.

Scene 10 Island of Ruin                         Cherry: Tree, Grape: House, Orange: Table.

Scene 11 Beecroft’s Stronghold             Cherry: Balloon, Grape: Stump, Orange: House.

Scene 12 Underground Passage           Cherry: House, Grape: Stump, Orange: Tree.

Scene 13 Visconti’s Castle                     Cherry: House, Grape: Balloon, Orange: Stump.

Scene 14 Throne Room                         Cherry: Tree, Grape: Table, Orange: Stump.

Scene 15 The Tower                              Cherry: Tree, Grape: Table, Orange: House.

Scene 16 Hall of Mirrors                        Cherry: Stump, Grape: House, Orange: Tree.

Scene 17 Royal Throne Room               Cherry: Stump, Grape: Balloon, Orange: Tree.