Gumball Easter Egg

After level 1:

                 --v--

              RBJRY JSYRR

                 --^--

After level 2:

                 --v--

              VRJJRY ZIAR

                 --^--

After level 3:

                 --v--

                 ESRB

                 --^--

After level 4:

                 --v--

              FIG YRJMYR

                 --^--

Taken together, they form a simple
substitution cipher:

ENTER THREE

LETTER CODE

WHEN

YOU RETIRE

But what is the code?

It turns out that pressing
*again*, while any of the pieces of the
cipher are on screen, reveals another
clue:

                 --v--

             DOUBLE HELIX

                 --^--

Entering the three-letter code "DNA" at
the "retirement" screen reveals the
final secret message:

                 --v--

AHA!  YOU MADE IT!
EITHER YOU ARE AN EXCELLENT GAME-PLAYER
OR (GAH!) PROGRAM-BREAKER!
YOU ARE CERTAINLY ONE OF THE FEW PEOPLE
THAT WILL EVER SEE THIS SCREEN.

THIS IS NOT THE END, THOUGH.

IN ANOTHER BR0DERBUND PRODUCT
TYPE 'Z0DWARE' FOR MORE PUZZLES.

HAVE FUN!  BYE!!

                      R.A.C.

                 --^--

At time of writing, no one has found
the 'Z0DWARE' puzzle. You could be the
first!

• https://ia801508.us.archive.org/18/items/Gumball4amCrack/Gumball%20%284am%20&%20san%20inc%20crack%29.txt
• http://www.digitpress.com/eastereggs/applegumball.htm
• http://motherboard.vice.com/en_ca/read/it-took-33-years-for-someone-to-find-the-easter-egg-in-this-apple-ii-game-gumball
• https://twitter.com/a2_4am/status/740623927530131456?lang=en