there are 2 secret badges in the game, the first (pray to pixelo god: +50%xp +50%gold +1 shield) is obtain via credits unlocked by "performer" prize (i obtained it by finishing "dish spinning", the first puzzle on the last page of normal). access the credits from the "home" page, wait till it scrolls to the bottom and click the square next to the word "you"
to get the 2nd badge (easter egg: raise pixelo duck!) simply drag the word "pixelo" on the homepage to the left and click the egg :) hope this helps, upvote to keep this alive!
secret badge unlock conditions:
1: pray to pixelo god (xp+50%, gold+50%, 1 shield)
must unlock credits (i unlocked it through completing the "dish spinning puzzle" which is the first puzzle on the last page of normal puzzles, unsure if theres a further unlock condition as the prize is called "performer") go to home page -> click on credits -> wait until it comes up with "you" and click the white box beside it
2: easter egg (raise pixelo duck)
simply drag the title "pixelo" on the homepage to the left
sorely tempted to reveal the two secret badges unlock conditions, however as the developer would like it to be a secret i'll simply give clues, both can be obtained from the home page, though one requires a prize to unlock a specific feature while the other you do not need to do any puzzles at all to acquire
 "Pixelo"){kind=icon}