My code didn't work
You need to do just a bit more than simply complete all 4 Trials. Each of the codes that you receive for a Trial are shown to you again after you defeat that Trial's Guardian only the second showing will have two different symbols missing from two different places each time. When these missing symbols are lined up in the correct order that they are shown and inputted as a fifth code you should initiate the fight against the Rainbow Guardian.
When you defeat the Rainbow Guardian you will be shown the entrance to the final treasure room and the Plant and Zombie chest containing the new character classes will become available for you to begin unlocking them with Rainbow Stars.
Each code is unique to the player so you can't use a code provided by someone else and the final code won't work until all four Guardians have been defeated. If the final code isn't working for you and you've defeated the four previous Guardians then you must be entering the code incorrectly.
