When you have collected ALL of the 33 Crimson Chin Cards in the game (this is made up of 4 cards in each of the 8 levels and another card in the prologue during Timmy's dream) the entire episode of Fairly Odd Parents will become unlocked.

If there is a certain level you want to play and don't want to play through the game to get to it then enter the corresponding passwords to unlock it.

Unlock Level 2:
Enter Wanda, Vicky, Country Boy, Cosmo, Bronze Knee Cap, Wanda, Country Boy.

Unlock Level 3:
Enter Wanda, Crimson Chin, Crimson Chin.

Unlock Level 4:
Enter Country Boy, Bronze Knee Cap, Spatula Lady.

Unlock Level 5:
Enter Country Boy, Crimson Chin, Cosmo.

Collect 4 crimson chin cards to unlock this clip