Successfully complete the game to unlock the "Gallery" option at the main menu.
Successfully complete the indicated task to unlock the corresponding job:
When the random Dokapon card game at the beginning of a week appears, play through it. Make a note of the location of all the cards. After you know their location, reset the game. Play the card game again, and get all the cards correct immediately to win 1,000,000.
At the lower right of the fourth continent is a small island that you cannot access. There is a tree on the island. Highlight the island, and read its description to view a secret message from the developers, thanking you for playing the game and showing the credits.