Get 10 Lives  -  Enter CANDLE CANDLE HEART HEART as a password. 

Check Sound  -  Enter HEART HEART HEART HEART as a password. 

Extra Hard Difficulty  -  Enter SPACE ORB SPACE ORB as a password. 

Level Passwords

After Crystal castle CANDLE HEART HEART ORB 
After Plant castle HEART HEART HEART SPACE 
After Rock castle HEART HEART ORB SPACE 
Dracula's castle HEART ORB CANDLE SPACE 
Dracula's castle part 2 HEART CANDLE ORB ORB 
Dracula's level ORB HEART CANDLE HEART 

Hint: When your climbing a rope, try to keep going up even if it looks as though there's nowhere to go. You can find lots of secret rooms containing power-ups and special weapons this way, and if you're on a rope beside a wall, try jumping into the wall. There are several places where you can find a shortcut through a stage, avoiding plenty of places where you might take a hit.

Secret Supplies  -  Play on the Castle in the upper left hand corner. When you come to the spot where there are three ladders and eyeballs are falling climb up the far left ladder. Keep climbing up through the wall for three candle sticks. Then climb down and do the same to the far right ladder for another candlestick.

Hidden rooms and passages: 

Crystal Castle  -  Climb any rope through the ceiling just past the second door,  where eyeballs are falling from above. 

Rock Castle  -  Continue all the way to the right after the third door. Climb  the rope up through the ceiling. 

Cloud Castle  -  Reach the room just before the third door. Climb the rope up  through the ceiling to warp to an earlier room, where you can  find meat in the bricks in the middle of the ceiling. 

Plant Castle  -  Continue to the left after the third door and climb the rope  through the ceiling. 

Dracula's Castle (Stage 2)
Climb through the ceiling in the room with a door, a large  bat, and an upside down monster that can take away your  character's stronger whips.

Crystal Castle  -  Whip the ceiling just above the second door. 

Crystal Castle  -  After the long drop past the spiked walls, whip the ceiling in  the middle of the screen with the door. 

Rock Castle  -  It is hidden in a candle above the high ledge, just before the  fourth door. 

Plant Castle  -  Whip the ceiling above the third door. Also, in the secret  room mentioned earlier, whip the closest floating brick to the  right side. 

Dracula's Castle (Stage 1)
After passing through the second door, whip the floor below  it.

Gameshark Codes

Description Code 
Infinite Energy 010D89CC 
Infinite Hearts [Note 1] 010988CC 
Infinite Time [Note 1] 010982CC