When you lose all your life and are taken to the Continue Screen you see a counter in the middle. When you stop the timer on certain Special Times different effects are granted:
7.77 - Jack gains 500 souls instead of losing some.
6.66 - Jack doesn't recover full health. He gets a single blinking pumpkin and doesn't lose souls.
0.01 - Jack gains 500 souls and complete refills of his Crystal Bottles, Blue Souls, and Red Souls. (Requires you have at least one Gold Pumpkin.)
All codes are entered during gameplay, or in Jack's house. Since there are not many for Jack's house, I'll label those accordingly. Also, there are confirmation sounds when cheats are entered correctly. The sound is what you hear when you make a selection on any menu in the game. Also, the cheats will not work if you're entering them while you're getting hit so make sure you're in a safe open area or be really fast at inputting the codes. You're able to still save the game when using these cheats so don't fret.
To put the coustumes on go to Jacks closet in his house
While you are playing around,Just press:
Down, Up, Right, Left, Left analog stick, Right analog stick