In the first level go to the briar patch and jump into it. Before Mowgli dies, pause the game and press B, A, Down, C, Right, A, B, Left, A, Right, Down, B, A, Left, Left, C, Up, Right, Left.
Harder Game
For a greater challenge, pause the game at any time and press A, B, B, A, A, B, B, A. Now run for it! You've only got 10 seconds to finish the level you're on.
Level skip
To do the level select code, pause the game and hit "BAABBAABABBAABBA"
Rapid-Fire
Select your weapon and press A,B,and C all at the same time. Mowgli will jump, and then he'll start consantly firing in the direction that you're facing.
Reset Health
To reset Mowgli's health, lives, weapons and timer, pause the game and press Up, Up, Down, Down, Left, Right, Left, Right, B, A. Mowgli will yell "Yeah!" and will return to full health with 3 lives remaining.
Skip To Baloo
Pause the game and press B, A, Left, Up, Up.
Skip To End
Pause the game and press B, A, Down, C, A, Right, Left, A, Right, Down. Alternatively, use the Level Skip code on any bonus round.
Skip To Kaa
Pause the game and press C, A, A, B, C, A, A.
Skip To King Louie
Pause the game and press Left, Up, A, Left, Up, A.
Skip To Shere Khan
Pause the game and press A, C, A, C, A, C, A, C, B, B, B, B.
Skip To Witch Doctor Monkeys
Pause the game and press Right, A, Down, B, A, Down.
Upside-Down Game
Pause the game and press Left, A, Right, Down, B, A, Left, Left, C, Right, Up, Down. The game will reset when you do this.