If you can make it to Level 20 / 30 / 40 / 50 without dying ONCE along the way, a secret door will appear. The Secret Rooms found in Level 20, 30 & 40 contain large amounts of bonus items as well as a SECRET ENCODED MESSAGE on the lower half of the screen.
The first line of the secret message is THE ALPHABET (ABCDE...) that you must use to decode the message. The code is the same for every room & will be needed to decode the secret message at the end of the game (to open up Super Bubble Bobble). You may want to take a screenshot of these rooms so you can decode the secret messages later as the game may force you to proceed through the game.
The Secret Door in level 50 is actually a 20-level warp, taking you directly to level 70.
Secret Tomb
Get all the way to Level 20 without dying, and a door will appear on the screen. Enter the door and you'll be taken to a secret tomb, which is a level full of diamonds.
Enter these as initials at the high score table
Description
Effect
KTT
beer-turns bubbles into pizzas at end of level
MTJ
coke can-flying sunflowers across the screen, turn enemies into 6k diamonds
YSH
coke can-flying sunflowers across the screen, turn enemies into 6k diamonds
KIM
coke can-flying sunflowers across the screen, turn enemies into 6k diamonds
NSO
coke can-flying sunflowers across the screen, turn enemies into 6k diamonds
I.F
coke can-flying sunflowers across the screen, turn enemies into 6k diamonds
STR
flamingo-turns bubbles into smiling turds at end of level
...
knife-flying cakes/vegetables/etc across the screen, turns enemy into 6k diamonds
TAK
octopus-turns bubbles into X's at end of level
SEX
pitch fork-flying cakes/turn enemies into 6k diamonds
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