Unlimited lives:
Load or reset the game, then execute the following BASIC command before running or restarting the program. 

POKE 29508,189 
Hint: Secret rooms:
Collect the gems in the following order to reach the secret rooms: Red, Orange, Yellow, Green, Blue, Indigo and Violet. The secret rooms will appear at the top of the level. Note: A different item needs to be collected in each room: 

Island 1: Magic Shoes 
Island 2: Red Pot 
Island 3: Yellow Pot 
Island 4: Book of Wings 
Island 5: Book of Continues 
Island 6: Feather 
Island 7: Money Bags